Annual report pursuant to Section 13 and 15(d)

Note 7 - Stockholders' Equity - Summary of Preferred Stock Offerings (Details)

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Note 7 - Stockholders' Equity - Summary of Preferred Stock Offerings (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Issuance of shares (in shares) 10,323  
gross proceeds $ 10,323,000  
fees 1,397,000  
Proceeds from issuance of preferred stock, net of issuance costs (Note 7) $ 8,926,000 $ 0
conversion shares (in shares) 18,269,000  
placement agent warrants (in shares) [1] 2,649,000  
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  
Series A Preferred Stock [Member]    
Conversion price (in dollars per share) $ 0.6200  
Issuance of shares (in shares) 5,359  
gross proceeds $ 5,359,000  
fees 752,000  
Proceeds from issuance of preferred stock, net of issuance costs (Note 7) $ 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 shares (in shares) 1,297  
gross proceeds $ 1,297,000  
fees 169,000  
Proceeds from issuance of preferred stock, net of issuance costs (Note 7) $ 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 shares (in shares) 1,733  
gross proceeds $ 1,733,000  
fees 225,000  
Proceeds from issuance of preferred stock, net of issuance costs (Note 7) $ 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 shares (in shares) 1,934  
gross proceeds $ 1,934,000  
fees 251,000  
Proceeds from issuance of preferred stock, net of issuance costs (Note 7) $ 1,683,000  
conversion shares (in shares) 5,088,000  
[1] To be issued upon final closing of the Series A Preferred Stock offering