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Note 4 - Capital Stock - Summary of Common Stock Outstanding (Details) - shares
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Dec. 31, 2023
Less Treasury Shares: (in shares) (7,553)       (7,553) (7,553)
Common stock, outstanding (in shares) 28,242,418       28,242,418 16,684,571
Common Stock [Member]            
Issued Shares (in shares)   16,692,000   2,071,000 16,692,000 2,071,000
Issuances from Preferred Stock conversions (in shares) 7,956,000 3,602,000 147,000   11,558,000 14,102,000
Issuances related to warrant exercises (in shares) 0   339,000     746,000
Issuances related to stock compensation (in shares) 0 0 180,000 0   180,000
Common shares exchanged for prepaid warrants (in shares)           (407,000)
Issued Shares (in shares) 28,250,000       28,250,000 16,692,000
Less Treasury Shares: (in shares) (8,000)       (8,000)  
Common stock, outstanding (in shares) 28,242,000       28,242,000