Note 7 - Stockholders' Equity and Equity-linked Instruments (Details Textual)

v3.25.1

Note 7 - Stockholders' Equity and Equity-linked Instruments (Details Textual)									1 Months Ended					3 Months Ended			9 Months Ended	12 Months Ended
		Oct. 24, 2024 USD ($) $ / shares	Sep. 12, 2023 USD ($) $ / shares shares	Sep. 07, 2023	Aug. 23, 2023 USD ($) $ / shares shares	Aug. 21, 2023 $ / shares shares	May 01, 2023 shares	Apr. 30, 2023 shares	Jan. 31, 2025 shares	Sep. 30, 2024 USD ($) $ / shares shares	Jul. 31, 2024 USD ($) shares	Jun. 30, 2024 USD ($) shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2024 USD ($) shares	Sep. 30, 2024 $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares		Oct. 04, 2024 shares	Aug. 31, 2024 shares	Jun. 04, 2024	May 31, 2024 shares	Dec. 22, 2023	Nov. 30, 2023 shares	May 30, 2023 $ / shares	May 29, 2023 shares
Percentage of Voters For Quorum at Business Meeting																							33.33%
Preferred Stock, Shares Authorized (in shares)													10,000,000	10,000,000				10,000,000	10,000,000									5,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares													$ 0.001	$ 0.001				$ 0.001	$ 0.001
Total Capital, Shares Authorized														110,000,000				110,000,000
Common Stock, Shares Authorized (in shares)													400,000,000	400,000,000				400,000,000	400,000,000									100,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares													$ 0.001	$ 0.001				$ 0.001	$ 0.001								$ 0.001
Preferred Stock, Stated Value | $														$ 1,000				$ 1,000
Preferred Stock, Shares Outstanding (in shares)													23,656	17,499				17,499	23,656
Deemed Dividend on Preferred Stock | $																		$ (0)	$ 7,567,000
Stock Issued During Period, Shares, New Issues									262,501									262,501
Common Stock Dividends, Shares											1,168,493
Fair Value Shares Issued | $											$ 1,589,000							$ 4,386,000	374,000	[1]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)							63,900	305,000										20,000
Proceeds From Issuance of Common Stock, Net of Issuance Costs | $																		$ 1,000,000	$ 1,885,000
Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input													0.0384						0.0384
Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input														1.01				1.01							0.98
Conversion of Series A and AA to Series AAA [Member]
Conversion of Stock, Shares Converted																	6,367
Converted to Common stock (in shares)																	6,367
Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input														0.0427				0.0427
Minimum [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input													4.5	2.71				2.71	4.5
Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input														0.0438				0.0438
Maximum [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input													5	4.74				4.74	5
Series AAA-3 & AAA-4 Junior Subscription Agreements [Member]
Stock Issued During Period, Shares, New Issues										1,096
Proceeds from Issuance or Sale of Equity | $										$ 1,096,000
Dividend Acceleration Agreements [Member]
Stock Issued During Period, Shares, New Issues													114,452
Stock Issued During Period, Value, New Issues | $													$ 174,000
Registered Direct Offering [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares		$ 0.001
Shares Issued, Price Per Share (in dollars per share) | $ / shares		$ 0.88
Common Stock, Maximum Shares Sold (in shares)																					1,136,364
Proceeds from Issuance of Common Stock | $		$ 1,000,000
Underwriting Agreement [Member]
Stock Issued During Period, Shares, New Issues						778,653
Shares Issued, Price Per Share (in dollars per share) | $ / shares					$ 2.6
Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised | $			$ 84,800
Proceeds From Issuance of Common Stock, Net of Issuance Costs | $					$ 1,800,000
Over-Allotment Option [Member]
Stock Issued During Period, Shares, New Issues			32,616
Shares Issued, Price Per Share (in dollars per share) | $ / shares			$ 2.6
Option, Period						45 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)						126,923
Series A A Preferred Stock [Member]
Preferred Stock, Shares Outstanding (in shares)					10,706									3,699				3,699								7,322
Preferred Stock, Convertible, Conversion Price | $ / shares					$ 2.6
Deemed Dividend on Preferred Stock | $																		$ 6,446,000
Fair Value Shares Issued | $															$ 216,000	$ 661,000
Preferred Stock, Extension Period of Exercise																		6 months
Series A A Preferred Stock [Member] | Subscription Agreements [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares														$ 0.001				$ 0.001
Preferred Stock, Convertible, Conversion Price | $ / shares														$ 2.12				$ 2.12
Preferred Stock, Period After Registration Agreement for Conversion																		18 months
Rights To Purchase, Number Of Preferred Stocks (in shares)														17,832				17,832
Preferred Stock, Convertible, Shares Issuable (in shares)														8,414,537				8,414,537
Series AAA-3 Junior Preferred Stock [Member]
Preferred Stock, Shares Outstanding (in shares)														697				697
Series AAA-3 Junior Preferred Stock [Member] | Series AAA-3 & AAA-4 Junior Subscription Agreements [Member]
Stock Issued During Period, Shares, New Issues													4,011
Series AAA-4 Junior Preferred Stock [Member]
Preferred Stock, Shares Outstanding (in shares)	[2],[3],[4],[5],[6],[7]													399				399
Series AAA-4 Junior Preferred Stock [Member] | Series AAA-3 & AAA-4 Junior Subscription Agreements [Member]
Stock Issued During Period, Shares, New Issues																		2,356
Series A Preferred Offerings [Member] | Subscription Agreements [Member]
Preferred Stock, Stated Value | $														$ 1,000				$ 1,000
Preferred Stock, Conversion Period With Discretion																		1 year
Preferred Stock, Beneficial Ownership Limitations, Percentage of Outstanding Shares Required to be Converted When Common Stock Volume-weighted Average Price Over Previous 10 Days as Reported Equals More Than 250% of Conversion Price														50.00%				50.00%
Preferred Stock, Beneficial Ownership Limitations, Percentage of Outstanding Shares Required to be Converted When Common Stock Volume-weighted Average Price Over Previous 10 Days as Reported Equals More Than 300% of Conversion Price														100.00%				100.00%
Preferred Stock, Automatic Conversion Period																		24 months
Preferred Stock, Percentage Consent Needed to Convert														51.00%				51.00%
Preferred Stock Dividends, Percentage of Common Shares														20.00%				20.00%
Preferred Stock Dividends, Period One																		12 months
Preferred Stock Dividends, Period Two																		24 months
Preferred Stock Dividends, Period Three																		90 days
Preferred Stock, Maximum Loans | $														$ 5,000,000				$ 5,000,000
Preferred Stock Voting Exceptions, Minimum Amount of Indebtedness Required | $														$ 5,000,000				$ 5,000,000
Series AAA Junior Preferred Stock [Member]
Preferred Stock, Shares Outstanding (in shares)														365				365
Fair Value Shares Issued | $															273,000
Preferred Stock, Extension Period of Exercise																		6 months
Series AAA Junior Preferred Stock [Member] | Subscription Agreements [Member]
Preferred Stock Dividends, Percentage of Common Shares														20.00%				20.00%
Preferred Stock Dividends, Period One																		30 days
Preferred Stock Dividends, Period Two																		60 days
Series AAA Convertible Preferred Stock [Member]
Preferred Stock, Shares Outstanding (in shares)														7,395				7,395
Fair Value Shares Issued | $														$ 415,000	$ 587,000
Series AAA Convertible Preferred Stock [Member] | Subscription Agreements [Member]
Preferred Stock, Stated Value | $														1,000				$ 1,000
Preferred Stock, Period After Registration Agreement for Conversion																		18 months
Preferred Stock, Down Round Feature, Period After Filing Date																		24 months
Subscription Agreements [Member] | Series A A Preferred Stock [Member]
Equity, Minimum Preferred Stock Purchased | $														$ 3,500,000				$ 3,500,000
Preferred Stock, Convertible, Conversion Percentage														125.00%				125.00%
Series AAA AIRs [Member]
Preferred Stock, Extension Period of Exercise																		3 months
Preferred Stock, Expiration Period																		21 months
Warrants Issued With Placement Agent Agreement [Member]
Warrants and Rights Outstanding, Term														5 years				5 years
Class of Warrants and Rights, Number of Securities Called by Warrants or Rights, Percentage of Total Common Stock Issuable Upon Conversion of Preferred Shares														14.50%				14.50%
Placement Agent Warrants With Series A-2 Preferred Stock [Member]
Class of Warrant or Right, Exchanged During Period (in shares)														88,403				88,403
Stock Issued During Period, Shares, Warrant Exchange (in shares)																		199,778
Shares Issued, Price Per Share (in dollars per share) | $ / shares														$ 1.71				$ 1.71
Placement Agent Warrants With Series A-2 Preferred Stock [Member] | Minimum [Member]
Class of Warrant or Right, Exchanged During Period, Exercise Price (in dollars per share) | $ / shares														7.6				7.6
Placement Agent Warrants With Series A-2 Preferred Stock [Member] | Maximum [Member]
Class of Warrant or Right, Exchanged During Period, Exercise Price (in dollars per share) | $ / shares														$ 13.41				$ 13.41
New Placement Agent Warrants [Member]
Class of Warrant or Right, Exchanged During Period (in shares)														347,428				347,428
Class of Warrant or Right, Exchanged During Period, Exercise Price (in dollars per share) | $ / shares														$ 1.674				$ 1.674
Series AAA-3 and AAA-4 Junior Preferred Stock Warrants [Member] | Series AAA-3 & AAA-4 Junior Subscription Agreements [Member]
Class of Warrant or Right, Exchanged During Period, Exercise Price (in dollars per share) | $ / shares										$ 1					$ 1		$ 1
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right										1,000					1,000		1,000
Class of Warrant or Right, Issued During Period, Purchase Price | $ / shares										$ 1,000
Series AA Preferred Additional Investment Rights [Member]
Class of Warrant or Right, Exchanged During Period (in shares)										3,336,293		3,215,232			3,336,293	3,215,232	3,336,293					667,289		642,962
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease) | $										$ 70,000		$ 294,000
Series AA Additional Investment Right [Member] | Minimum [Member] | Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input										0.72					0.72		0.72
Series AA Additional Investment Right [Member] | Minimum [Member] | Measurement Input, Conversion Price [Member]
Warrants and Rights Outstanding, Measurement Input										1.856					1.856		1.856
Series AA Additional Investment Right [Member] | Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input										0.0464					0.0464		0.0464
Series AA Additional Investment Right [Member] | Minimum [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input										0.24					0.24		0.24
Series AA Additional Investment Right [Member] | Minimum [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input										0.68					0.68		0.68
Series AA Additional Investment Right [Member] | Maximum [Member] | Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input														0.86				0.86
Series AA Additional Investment Right [Member] | Maximum [Member] | Measurement Input, Conversion Price [Member]
Warrants and Rights Outstanding, Measurement Input										13.25					13.25		13.25
Series AA Additional Investment Right [Member] | Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input										0.0536					0.0536		0.0536
Series AA Additional Investment Right [Member] | Maximum [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input										0.92					0.92		0.92
Series AA Additional Investment Right [Member] | Maximum [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input										0.91					0.91		0.91
Pre-Funded Warrant [Member]
Shares Issued, Price Per Share (in dollars per share) | $ / shares					$ 2.58								$ 2.6						$ 2.6
Class of Warrant or Right, Issued During Period (in shares)						67,500
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share) | $ / shares						$ 0.001
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio				20
[1] Fair valued based on the closing price of the Company’s common stock on the respective common stock dividend payment date. [2] As adjusted to reflect reduction in conversion prices as a result of the Series AA Down Round Feature, described below. [3] Pursuant to the terms of the Placement Agent Agreements, we agreed to issue to the Placement Agent, following the final closing under the individual Preferred Stock Offerings (effective as of the respective individual series closing dates), five-year warrants to purchase 14.5% of the shares of common stock issuable upon conversion of the respective series of Convertible Preferred Stock sold in the respective Preferred Stock Offering, at an exercise price equal to the applicable Preferred Stock Offering conversion price. See below for placement agent warrants exchanged in connection with the Exchange. [4] Series AAA and Series AAA-2 totals include 4,011 and 2,356 preferred shares, respectively, issued in connection with the Exchange Agreements described below. [5] The Conversion price for Series AA Preferred Stock outstanding as of August 23, 2023, totaling 10,706 shares of Series AA Preferred Stock, was adjusted to $2.60 as a result of the Series AA Down Round Feature described below. [6] The Conversion prices for the Series AA Preferred Stock outstanding as of November 30, 2023, totaling 7,322 shares of Series AA Preferred Stock, were adjusted to the conversion prices shown in the table above, as a result of the Series AA Down Round Feature described below. [7] The triggering of the Down Round Feature for the Series AA Preferred Stock, occurring in August 2023, resulted in a deemed dividend totaling $6,446,000, which was charged to retained earnings in the September 30, 2023 consolidated balance sheet.