Marketable Securities: Amortized cost, fair value and gross unrealized holding gains and losses of marketable securities (Details) - USD ($)	Jun. 30, 2023	Mar. 31, 2023
Amortized Cost	$ 55,041,680	$ 54,098,122
Gross Unrealized Holding Gains	1	1,007
Gross Unrealized Holding Losses	(1,854,275)	(1,554,846)
Marketable Securities	53,187,406	52,544,283
Money Market Funds
Amortized Cost	1,294,300	906,141
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Marketable Securities	1,294,300	906,141
Corporate Bond Securities
Amortized Cost	53,747,380	53,191,981
Gross Unrealized Holding Gains	1	1,007
Gross Unrealized Holding Losses	(1,854,275)	(1,554,846)
Marketable Securities	$ 51,893,106	$ 51,638,142