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Note 10 - Marketable Securities - Summary of Investments (Details) - USD ($)
Mar. 31, 2025
Mar. 31, 2024
Equity Securities, FV-NI, Cost $ 639,217 $ 634,705
Equity Securities, FV-NI, Current 682,051 663,682
Equity Securities, FV-NI, Accumulated Unrealized Gain (Loss) 42,834 28,977
Other Short-term Investments, At Cost 6,169,946 6,858,943
Other Short-term Investments, Fair Value 6,169,946 6,858,943
Debt Securities, Held to Maturity and Equity Securities, FV-NI, Cost 6,809,163 7,493,648
Debt Securities, Held to Maturity and Equity Securities, FV-NI, Fair Value 6,851,997 7,522,625
Debt Securities, Held to Maturity and Equity Securities, FV-NI, Unrealized Gain (Loss) 42,834 28,977
Certificates of Deposit [Member]    
Other Short-term Investments, At Cost 370,000 570,000
Other Short-term Investments, Fair Value 370,000 570,000
US Treasury Bill Securities [Member]    
Other Short-term Investments, At Cost 5,799,946 6,288,943
Other Short-term Investments, Fair Value $ 5,799,946 $ 6,288,943