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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

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- Definition Fair value of investment in debt securities classified as held to maturity and equity securities. + References No definition available. + Details
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