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Note 9 - Marketable Securities - Summary of Investments (Details) - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Equity and other mutual funds, cost $ 583,103  
Equity and other mutual funds, fair value 617,086  
Equity and other mutual funds, unrealized gain 33,983  
Fixed income certificates of deposit, cost 836,456 $ 275,000
Fixed income certificates of deposit, fair value 836,456 275,000
Fixed income certificates of deposit, unrealized loss 0  
Marketable securities, cost 1,419,559 849,330
Marketable securities 1,453,542 851,318
Marketable securities, unrealized loss $ 33,983 1,988
Equity And Other Mutual Funds [Member]    
Equity and other mutual funds, cost   574,330
Equity and other mutual funds, fair value   576,318
Equity and other mutual funds, unrealized gain   $ 1,988