Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Stockholders' Equity - Summary of Preferred Stock Offerings (Details)

v3.23.1
Note 6 - Stockholders' Equity - Summary of Preferred Stock Offerings (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Issuance of Series A-5 preferred stock at $1,000 per share (Note 6) (in shares) 12,622   10,323
Gross proceeds $ 12,622,000   $ 10,323,000
Fees 1,696,000   1,397,000
Proceeds from issuance of preferred stock, net of issuance costs (Note 6) $ 1,919,000 $ 0 $ 8,926,000
Conversion shares (in shares) 22,414,000   18,269,000
Placement agent warrants (in shares) 3,250,000   2,649,000
Aggregate Proceeds from Issuance of Preferred Stock, Net $ 10,926,000    
Placement Agent Warrants With Series A Preferred Stock [Member]      
Placement agent warrants (in shares) [1]     1,253,000
Placement Agent Warrants With Series A-2 Preferred Stock [Member]      
Placement agent warrants (in shares) [1]     283,000
Placement Agent Warrants With Series A-3 Preferred Stock [Member]      
Placement agent warrants (in shares) [1]     375,000
Placement Agent Warrants With Series A-4 Preferred Stock [Member]      
Placement agent warrants (in shares) [1]     738,000
Placement Agent Warrants With Series A5 Preferred Stock [Member]      
Placement agent warrants (in shares) 601,000    
Series A Preferred Stock [Member]      
Conversion price (in dollars per share)     $ 0.6200
Issuance of Series A-5 preferred stock at $1,000 per share (Note 6) (in shares)     5,359
Gross proceeds     $ 5,359,000
Fees     752,000
Proceeds from issuance of preferred stock, net of issuance costs (Note 6)     $ 4,607,000
Conversion shares (in shares)     8,644,000
Series A-2 Preferred Stock [Member]      
Conversion price (in dollars per share)     $ 0.6646
Issuance of Series A-5 preferred stock at $1,000 per share (Note 6) (in shares)     1,297
Gross proceeds     $ 1,297,000
Fees     169,000
Proceeds from issuance of preferred stock, net of issuance costs (Note 6)     $ 1,128,000
Conversion shares (in shares)     1,952,000
Series A-3 Preferred Stock [Member]      
Conversion price (in dollars per share)     $ 0.6704
Issuance of Series A-5 preferred stock at $1,000 per share (Note 6) (in shares)     1,733
Gross proceeds     $ 1,733,000
Fees     225,000
Proceeds from issuance of preferred stock, net of issuance costs (Note 6)     $ 1,508,000
Conversion shares (in shares)     2,585,000
Series A-4 Preferred Stock [Member]      
Conversion price (in dollars per share)     $ 0.3801
Issuance of Series A-5 preferred stock at $1,000 per share (Note 6) (in shares)     1,934
Gross proceeds     $ 1,934,000
Fees     251,000
Proceeds from issuance of preferred stock, net of issuance costs (Note 6)     $ 1,683,000
Conversion shares (in shares)     5,088,000
Series A-5 Preferred Stock [Member]      
Conversion price (in dollars per share) $ 0.5546    
Issuance of Series A-5 preferred stock at $1,000 per share (Note 6) (in shares) 2,299    
Gross proceeds $ 2,299,000    
Fees 299,000    
Proceeds from issuance of preferred stock, net of issuance costs (Note 6) $ 2,000,000    
Conversion shares (in shares) 4,145,000    
[1] To be issued upon final closing of the Series A Preferred Stock offering