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Note 3 - Net Loss Per Common Stock Share (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 28, 2024
Jul. 18, 2023
Apr. 02, 2023
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Exchange Agreement, Senior Secured Convertible Promissory Note for Preferred Shares [Member]                  
Debt Conversion, Original Debt, Amount $ 8 $ 6 $ 8   $ 7,200,000 $ 8 $ 2,400,000 $ 17,600,000 $ 14,000,000
Debt Conversion, Converted Instrument, Shares Issued (in shares)         8,837.58 8,000 2,997    
Debt Conversion, Original Accrued Interest, Amount         $ 1,630,000   $ 0.59    
Debt Conversion, Original Debt and Accrued Interest, Amount       $ 3 $ 8.8   $ 3    
Restricted Stock Units (RSUs) [Member]                  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)             56,239    
Warrant [Member]                  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)             15,416