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Note 4 - Capital Stock (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended 18 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Jun. 30, 2024
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.0001 $ 0.0001   $ 0.0001 $ 0.0001
Common Stock, Shares Authorized (in shares) 150,000,000 150,000,000   150,000,000 150,000,000
Common Stock, Shares, Issued (in shares) 28,249,971 28,249,971   16,692,124 28,249,971
Common Stock, Shares, Outstanding (in shares) 28,242,418 28,242,418   16,684,571 28,242,418
Dividends, Preferred Stock   $ 64,000 $ 149,000    
Common Stock [Member]          
Common Stock, Shares, Outstanding (in shares) 28,242,000 28,242,000     28,242,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 1.71 $ 1.71     $ 1.71
Conversion of Series F Preferred Stock to Common Stock [Member]          
Conversion of Stock, Shares Converted (in shares) 2,111 3,033      
Dividends, Preferred Stock $ 110,000 $ 194,000      
Conversion of Stock, Shares Issued (in shares) 7,955,743 11,558,000   14,102,000 25,660,000