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Note C - Marketable Securities - Summary of Investments (Details) - USD ($)
Dec. 31, 2025
Mar. 31, 2024
Equity Securities, FV-NI, Cost $ 713,120 $ 634,705
Equity Securities, FV-NI, Current 777,963 663,682
Equity Securities, FV-NI, Accumulated Unrealized Gain (Loss) 64,843 28,977
Other Short-term Investments, cost   6,858,943
Other Short-term Investments, fair value   6,858,943
Marketable securities, cost 7,257,803 7,493,648
Marketable securities, fair value 7,322,646 7,522,625
Marketable securities, unrealized gain 64,843 28,977
Certificates of Deposit [Member]    
Other Short-term Investments, cost   570,000
Other Short-term Investments, fair value   570,000
US Treasury Bill Securities [Member]    
Other Short-term Investments, cost 6,544,683 6,288,943
Other Short-term Investments, fair value $ 6,544,683 $ 6,288,943