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Note 4 - Capital Stock - Make Whole Provision Transactions (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Aug. 23, 2024
Warrants outstanding (in shares) 2,345,603   2,345,603    
Warrants, deemed dividend $ 8,974,000 $ 0 $ 8,974,000 $ 0  
Original Warrants [Member]          
Warrants outstanding (in shares) 5,100,595   5,100,595    
Aggregate Exercise Price $ 8,722,000   $ 8,722,000    
Warrants Post Reverse Split [Member]          
Warrants outstanding (in shares) [1] 127,531   127,531    
Aggregate Exercise Price [1] $ 8,722,000   $ 8,722,000    
Warrants Post Make Whole Provision [Member]          
Warrants outstanding (in shares) [2] 2,554,517   2,554,517    
Aggregate Exercise Price [2] $ 8,722,000   $ 8,722,000    
Warrants Issued on March 31, 2023 [Member]          
Warrants outstanding (in shares) 19   19    
Warrants, exercise price (in dollars per share) $ 2,640   $ 2,640    
Warrants, deemed dividend     $ 6,739,000    
Warrants Issued on March 31, 2023 [Member] | Original Warrants [Member]          
Warrants outstanding (in shares) 3,830,417   3,830,417    
Warrants, exercise price (in dollars per share) [3] $ 1.71   $ 1.71    
Warrants Issued on March 31, 2023 [Member] | Warrants Post Reverse Split [Member]          
Warrants outstanding (in shares) [1] 95,764   95,764    
Warrants, exercise price (in dollars per share) $ 68.4   $ 68.4    
Warrants Issued on March 31, 2023 [Member] | Warrants Post Make Whole Provision [Member]          
Warrants outstanding (in shares) [2] 1,918,371   1,918,371    
Warrants, exercise price (in dollars per share) [4] $ 3.41   $ 3.41    
Warrants Issued in Q2 2024 [Member]          
Warrants, deemed dividend     $ 1,696,000    
Warrants Issued in Q2 2024 [Member] | Original Warrants [Member]          
Warrants outstanding (in shares) 963,745   963,745    
Warrants, exercise price (in dollars per share) [3] $ 1.71   $ 1.71    
Warrants Issued in Q2 2024 [Member] | Warrants Post Reverse Split [Member]          
Warrants outstanding (in shares) [1] 24,104   24,104    
Warrants, exercise price (in dollars per share) $ 68.4   $ 68.4    
Warrants Issued in Q2 2024 [Member] | Warrants Post Make Whole Provision [Member]          
Warrants outstanding (in shares) [2] 482,676   482,676    
Warrants, exercise price (in dollars per share) [4] $ 3.41   $ 3.41    
Placement Agent Warrants [Member]          
Warrants outstanding (in shares)         153,470
Warrants, deemed dividend     $ 539,000    
Placement Agent Warrants [Member] | Original Warrants [Member]          
Warrants outstanding (in shares) 306,433   306,433    
Warrants, exercise price (in dollars per share) [3] $ 1.71   $ 1.71    
Placement Agent Warrants [Member] | Warrants Post Reverse Split [Member]          
Warrants outstanding (in shares) [1] 7,663   7,663    
Warrants, exercise price (in dollars per share) $ 68.4   $ 68.4    
Placement Agent Warrants [Member] | Warrants Post Make Whole Provision [Member]          
Warrants outstanding (in shares) [2] 153,470   153,470    
Warrants, exercise price (in dollars per share) [4] $ 3.41   $ 3.41    
[1] Adjusted by the Reverse Split.
[2] Based on the original aggregate exercise price divided by the Make Whole Provision exercise price.
[3] Original exercise price based on the March 30, 2023 initial exercise price.
[4] Calculated by dividing (x) the sum of the dollar volume-weighted average price of the Company's Common Stock for each of the five lowest trading days during the sixteen trading days after the Reverse Split by (y) five.