Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Subsequent Events - Series AA Offerings (Details)

v3.23.1
Note 7 - Subsequent Events - Series AA Offerings (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
May 05, 2023
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
Subsequent Event [Member] | Placement Agent Warrants With Series AA Preferred Stock [Member]        
Placement agent warrants (in shares) 2,285,000      
Subsequent Event [Member] | Placement Agent Warrants With Series AA-2 Preferred Stock [Member]        
Placement agent warrants (in shares) 278,000      
Subsequent Event [Member] | Placement Agent Warrants With Series AA-3 Preferred Stock [Member]        
Placement agent warrants (in shares) 313,000      
Subsequent Event [Member] | Placement Agent Warrants With Series AA-4 Preferred Stock [Member]        
Placement agent warrants (in shares) 320,000      
Series AA Convertible Preferred Stock [Member] | Subsequent Event [Member]        
Conversion price (in dollars per share) $ 0.4715      
Issuance of Series A-5 preferred stock at $1,000 per share (Note 6) (in shares) 7,680      
Gross proceeds $ 7,680,000      
Fees 966,000      
Proceeds from issuance of preferred stock, net of issuance costs (Note 6) $ 6,714,000      
Conversion shares (in shares) 16,288,000      
Series AA-2 Convertible Preferred Stock [Member] | Subsequent Event [Member]        
Conversion price (in dollars per share) $ 0.5215      
Issuance of Series A-5 preferred stock at $1,000 per share (Note 6) (in shares) 1,500      
Gross proceeds $ 1,500,000      
Fees 130,000      
Proceeds from issuance of preferred stock, net of issuance costs (Note 6) $ 1,370,000      
Conversion shares (in shares) 2,876,000      
Series AA-3 Convertible Preferred Stock [Member] | Subsequent Event [Member]        
Conversion price (in dollars per share) $ 0.4750      
Issuance of Series A-5 preferred stock at $1,000 per share (Note 6) (in shares) 1,025      
Gross proceeds $ 1,025,000      
Fees 133,000      
Proceeds from issuance of preferred stock, net of issuance costs (Note 6) $ 892,000      
Conversion shares (in shares) 2,158,000      
Series AA-4 Convertible Preferred Stock [Member] | Subsequent Event [Member]        
Conversion price (in dollars per share) $ 0.4642      
Issuance of Series A-5 preferred stock at $1,000 per share (Note 6) (in shares) 1,026      
Gross proceeds $ 1,026,000      
Fees 133,000      
Proceeds from issuance of preferred stock, net of issuance costs (Note 6) $ 893,000      
Conversion shares (in shares) 2,210,000      
Series AA, AA-2, AA-3, and AA-4 Convertible Preferred Stock [Member] | Subsequent Event [Member]        
Issuance of Series A-5 preferred stock at $1,000 per share (Note 6) (in shares) 11,231      
Gross proceeds $ 11,231,000      
Fees 1,362,000      
Proceeds from issuance of preferred stock, net of issuance costs (Note 6) $ 9,869,000      
Conversion shares (in shares) 23,532,000      
Placement agent warrants (in shares) 3,196,000