Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Apr. 01, 2022
Income Tax Contingency [Line Items]
Retained earnings	$ 137,994,264	$ 97,154,898
U.S. federal income tax rate (in hundredths)	21.00%	21.00%	21.00%
State net operating loss carryforwards	$ 5,481,746	$ 4,851,747
Other, net	384,352	502,153	$ (11,994)
Decrease in valuation allowance related to capital loss carryforward	(7,100,000)
Valuation allowance	8,094,712	15,209,271
Foreign tax credit carryforward	3,254,926	3,254,926
Other loss carryforward	200,000
Capital loss carryforward	192,767	7,966,326
Total gross unrecognized tax benefits including interest	1,100,000	1,100,000	2,200,000
Unrecognized tax benefits that are permanent in nature and, if recognized, would affect the annual effective tax rate	900,000	900,000	2,000,000
Gross unrecognized tax benefit expected to resolved	400,000
Accrued gross interest	300,000	300,000	600,000
Current period gross interest expense	100,000	100,000	$ 200,000
Impact of ASC 326 adoption | Accounting Standards Update 2023-02
Income Tax Contingency [Line Items]
Retained earnings				$ 1,900,000
United States
Income Tax Contingency [Line Items]
Capital loss carryforward	900,000
Domestic Tax Authority
Income Tax Contingency [Line Items]
Operating loss carryforwards	94,400,000
Other, net	800,000
Operating loss subject to expiration	1,000
Domestic Tax Authority | Colorado
Income Tax Contingency [Line Items]
Operating loss subject to expiration	73,600,000
Valuation allowance	4,600,000
Historic Tax Credit Investment
Income Tax Contingency [Line Items]
Equity method investment	24,800,000	23,000,000
Historic tax credit investments amortization	8,800,000	2,100,000
Tax benefits from these investments	$ 9,700,000	$ 1,900,000