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Note 3 - Marketable Securities - Summary of Assets Measured at Fair Value By Measurement Input Level (Details) - USD ($)
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Balance $ 8,015,882  
Purchases 22,573,384 $ (0)
Sales (25,523,637) $ 0
Change in fair value (352,601)  
Balance 4,713,028  
Fair Value, Inputs, Level 1 [Member]    
Balance 8,015,882  
Purchases 22,573,384  
Sales (25,523,637)  
Change in fair value (352,601)  
Balance 4,713,028  
Fair Value, Inputs, Level 2 [Member]    
Balance 0  
Purchases 0  
Sales 0  
Change in fair value 0  
Balance 0  
Fair Value, Inputs, Level 3 [Member]    
Balance 0  
Purchases 0  
Sales 0  
Change in fair value 0  
Balance $ 0