NOTE 5. MARKETABLE SECURITIES: Amortized cost, fair value and gross unrealized holding gains and losses of marketable securities (Details) - USD ($)	Jun. 30, 2025	Mar. 31, 2025
Amortized Cost	$ 47,071,634	$ 47,989,000
Gross Unrealized Holding Gains	115,777	71,410
Gross Unrealized Holding Losses	(107,048)	(159,152)
Marketable Securities	47,080,363	47,901,258
Money Market Funds
Amortized Cost	2,782,189	7,905,042
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Marketable Securities	2,782,189	7,905,042
US Treasury Securities
Amortized Cost	4,699,728	4,699,686
Gross Unrealized Holding Gains	22,487	15,552
Gross Unrealized Holding Losses	0	0
Marketable Securities	4,722,215	4,715,238
Corporate Bond Securities
Amortized Cost	39,589,717	35,384,272
Gross Unrealized Holding Gains	93,290	55,858
Gross Unrealized Holding Losses	(107,048)	(159,152)
Marketable Securities	$ 39,575,959	$ 35,280,978