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NOTE 5. MARKETABLE SECURITIES: Gross unrealized holding losses and estimated fair value of marketable securities for which an allowance for credit losses has not been recorded (Details) - USD ($)	Sep. 30, 2025	Mar. 31, 2025
Estimated Fair Value	$ 1,964,850	$ 7,323,059
Gross Unrealized Holding Losses	(498)	(31,808)
Estimated Fair Value	8,199,095	21,020,717
Gross Unrealized Holding Losses	(18,209)	(127,344)
Estimated Fair Value	10,163,945	28,343,776
Gross Unrealized Holding Losses	(18,707)	(159,152)
Corporate Bond Securities
Estimated Fair Value	1,964,850	7,323,059
Gross Unrealized Holding Losses	(498)	(31,808)
Estimated Fair Value	8,199,095	21,020,717
Gross Unrealized Holding Losses	(18,209)	(127,344)
Estimated Fair Value	10,163,945	28,343,776
Gross Unrealized Holding Losses	$ (18,707)	$ (159,152)

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