Note 6 - Stockholders' (Deficit) Equity and Equity-linked Instruments (Details Textual)

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Note 6 - Stockholders' (Deficit) Equity and Equity-linked Instruments (Details Textual)								1 Months Ended					3 Months Ended		4 Months Ended	5 Months Ended	6 Months Ended				9 Months Ended	12 Months Ended
		Jul. 11, 2025 shares	Jun. 17, 2025	May 30, 2025 USD ($) $ / shares shares	May 29, 2025 USD ($) $ / shares shares	May 09, 2025 USD ($) $ / shares shares	Feb. 14, 2025 USD ($) shares	Jun. 30, 2025 USD ($) $ / shares shares	Jan. 31, 2025 shares	Sep. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2024 USD ($) $ / shares shares	Dec. 31, 2023 shares	Jun. 30, 2025 USD ($) $ / shares shares	Jun. 30, 2024 USD ($) $ / shares shares	May 09, 2025 $ / shares shares	May 29, 2025 $ / shares shares	Jun. 30, 2025 USD ($) $ / shares shares		Jun. 30, 2024 USD ($) $ / shares shares		Sep. 30, 2023 USD ($)	May 30, 2025 $ / shares shares	Dec. 31, 2024 $ / shares shares	Jul. 31, 2025 $ / shares	May 31, 2024 shares	Mar. 31, 2024	Nov. 30, 2023 shares	Aug. 23, 2023 $ / shares shares	May 29, 2023 shares
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				110,000,000
Stock Issued During Period, Shares, New Issues (in shares)									6,563														6,563
Common Stock, Shares Authorized (in shares)				400,000,000				400,000,000					400,000,000				400,000,000					400,000,000	400,000,000						100,000,000
Preferred Stock, Stated Value | $								$ 1,000					$ 1,000				$ 1,000
Preferred Stock, Shares Outstanding (in shares)								16,426					16,426				16,426						17,499
Common Stock Dividends, Shares											23,076
Fair Value Shares Issued | $											$ 729,000						$ 101,000	[1]	$ 868,000	[1]
Placement Agent Fee, Percentage				8.00%																		8.00%
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares								$ 0.001					$ 0.001				$ 0.001						$ 0.001
Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input											0.0421			0.0421					0.0421
Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input											0.98			0.98					0.98				1.01
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								0.0368					0.0368				0.0368						0.0427
Minimum [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input								2.21					2.21				2.21						2.71			3.89
Minimum [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input								1.03					1.03				1.03
Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input								0.0374					0.0374				0.0374						0.0438
Maximum [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input								4.24			4.47		4.24	4.47			4.24		4.47				4.74
Maximum [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input								1.07					1.07				1.07
Series AAA-3 & AAA-4 Junior Subscription Agreements [Member]
Stock Issued During Period, Shares, New Issues (in shares)										1,096
Proceeds from Issuance or Sale of Equity | $										$ 1,096,000
May III Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)																						79,750
Proceeds from Issuance or Sale of Equity | $				$ 670,000
Shares Issued, Price Per Share | $ / shares				$ 4.8																		$ 4.8
May II Underwriting Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)					10,417
Shares Issued, Price Per Share | $ / shares					$ 4.8											$ 4.8
Equity Offering, Maximum Shares to be Issued					104,167											104,167
Proceeds from Issuance of Common Stock | $					$ 380,000
May II Over Allotment Option [Member]
Option, Period					45 days
Stock Issuable During Period (in shares)																10,417
Underwriting Agreement [Member]
Shares Issued, Price Per Share | $ / shares						$ 6.8									$ 6.8
Equity Offering, Maximum Shares to be Issued						127,941									127,941
Proceeds from Issuance of Common Stock | $						$ 700,400
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares						$ 0.001									$ 0.001
Over-Allotment Option [Member]
Shares Issued, Price Per Share | $ / shares						$ 6.8									$ 6.8
Option, Period						45 days
Stock Issuable During Period (in shares)						15,441									19,191
Proceeds from Issuance of Common Stock | $						$ 104,999
Equity Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)							7,500						0				17,925
Shares Issued, Price Per Share | $ / shares								$ 13.6					$ 13.6				$ 13.6
Proceeds from Issuance of Common Stock | $																	$ 231,000
Equity Offering, Maximum Amount | $							$ 2,900,000
Stock Issued During Period, Value, New Issues | $							$ 159,000
Equity Offering, Price Per Share, Percentage of Closing Price							92.00%
Warrants Issued With Placement Agent Agreement [Member]
Warrants and Rights Outstanding, Term								5 years					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%				14.50%
Placement Agent Warrants With Series A-2 Preferred Stock [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								2,210					2,210				2,210
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares								$ 68.4					$ 68.4				$ 68.4
Placement Agent Warrants With Series A-2 Preferred Stock [Member] | Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares								304					304				304
Placement Agent Warrants With Series A-2 Preferred Stock [Member] | Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares								$ 536.4					$ 536.4				$ 536.4
New Placement Agent Warrants, Exercise Price of 66.96 [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								8,686					8,686				8,686
New Placement Agent Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares								$ 66.96					$ 66.96				$ 66.96
New Placement Agent Warrants, Exercise Price of 68.40 [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								4,994					4,994				4,994
Series AAA-3 & AAA-4 Junior Subscription Agreements [Member] | Series AAA-3 and AAA-4 Junior Preferred Stock Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares										$ 40
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right										25
Class of Warrant or Right, Issued During Period, Purchase Price | $ / shares										$ 1,000
Series AA Additional Investment Right [Member] | Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input											34.4			34.4					34.4
Series AA Additional Investment Right [Member] | Minimum [Member] | Measurement Input, Conversion Price [Member]
Warrants and Rights Outstanding, Measurement Input											75.44			75.44					75.44
Series AA Additional Investment Right [Member] | Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input											0.0513			0.0513					0.0513
Series AA Additional Investment Right [Member] | Minimum [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input											0.42			0.42					0.42
Series AA Additional Investment Right [Member] | Minimum [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input											0.79			0.79					0.79
Series AA Additional Investment Right [Member] | Maximum [Member] | Measurement Input, Conversion Price [Member]
Warrants and Rights Outstanding, Measurement Input											530			530					530
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
Series AA Preferred Additional Investment Rights [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)											80,381			80,381					80,381						16,074
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease) | $											$ 294,000
Pre-Funded Warrant [Member]
Shares Issued, Price Per Share | $ / shares				$ 4.79																		$ 4.79
Class of Warrant or Right, Issued During Period				59,833
Class of Warrant or Right, Issued During Period, Exercise Price | $ / shares				$ 0.00001
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio			40					40
Series AAAA Junior Convertible Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)		3,775,047
Series A A Preferred Stock [Member]
Preferred Stock, Shares Outstanding (in shares)								3,639					3,639				3,639										7,322	10,706
Preferred Stock, Convertible, Conversion Price | $ / shares																												$ 104
Deemed Dividend on Preferred Stock | $																					$ 6,446,000
Fair Value Shares Issued | $	[1]												$ 89,000	$ 662,000
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				$ 0.001
Preferred Stock, Period After Registration Agreement for Conversion													18 months
Equity, Minimum Preferred Stock Purchased | $								$ 3,500,000					$ 3,500,000				$ 3,500,000
Preferred Stock, Convertible, Conversion Percentage								125.00%					125.00%				125.00%
Series AAA Convertible Preferred Stock [Member]
Preferred Stock, Shares Outstanding (in shares)								7,245					7,245				7,245
Preferred Stock, Convertible, Conversion Price | $ / shares																								$ 20.08
Series AAA Convertible Preferred Stock [Member] | Series A & AA Exchange Agreements [Member]
Stock Issued During Period, Shares, New Issues (in shares)												4,011
Series AAA Convertible Preferred Stock [Member] | Subscription Agreements [Member]
Preferred Stock, Stated Value | $								$ 1,000					$ 1,000				$ 1,000
Series AAA-2 Convertible Preferred Stock [Member]
Preferred Stock, Shares Outstanding (in shares)								3,148					3,148				3,148
Preferred Stock, Convertible, Conversion Price | $ / shares																								20.52
Series AAA-2 Convertible Preferred Stock [Member] | Series A & AA Exchange Agreements [Member]
Stock Issued During Period, Shares, New Issues (in shares)													2,356
Series A Preferred Offerings [Member] | Subscription Agreements [Member]
Preferred Stock, Stated Value | $								$ 1,000					$ 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%				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%				100.00%
Preferred Stock, Automatic Conversion Period													24 months
Preferred Stock, Percentage Consent Needed to Convert								51.00%					51.00%				51.00%
Preferred Stock Dividends, Percentage of Common Shares								20.00%					20.00%				20.00%
Preferred Stock Dividends, Period One													12 months
Preferred Stock Dividends, Period Two													24 months
Preferred Stock, Maximum Loans | $								$ 5,000,000					$ 5,000,000				$ 5,000,000
Preferred Stock Voting Exceptions, Minimum Amount of Indebtedness Required | $								$ 5,000,000					$ 5,000,000				$ 5,000,000
Series AAA Junior Preferred Stock [Member]
Preferred Stock, Shares Outstanding (in shares)								352					352				352
Preferred Stock, Convertible, Conversion Price | $ / shares																								$ 15
Shares Issued, Price Per Share | $ / shares								$ 1,000			$ 1,000		$ 1,000	$ 1,000			$ 1,000		$ 1,000
Series AAA Junior Preferred Stock [Member] | Subscription Agreements [Member]
Preferred Stock Dividends, Percentage of Common Shares								20.00%					20.00%				20.00%
Preferred Stock Dividends, Period One													30 days
Preferred Stock Dividends, Period Two													60 days
Preferred Stock Dividends, Period Three													90 days
Subscription Agreements [Member] | Series AAA Convertible Preferred Stock [Member]
Preferred Stock, Period After Registration Agreement for Conversion													18 months
Preferred Stock, Down Round Feature, Period After Filing Date													24 months
[1] Fair valued based on the closing price of the Company’s common stock on the respective common stock dividend payment date.