Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Apr. 01, 2023	Apr. 01, 2022
Income Tax Contingency [Line Items]
Retained earnings	$ 97,154,898	$ 92,117,343
U.S. federal income tax rate (in hundredths)		21.00%
State net operating loss carryforwards	4,851,747	$ 3,849,158
Other, net	740,340	(63,722)	$ 746,619
Increased deferred tax asset valuation allowance	500,000
Valuation allowance	15,209,271	14,723,244
Foreign tax credit carryforward	3,254,926	3,254,926
Capital loss carryforward	7,966,326	7,966,326
Other loss carryforward	200,000
Total gross unrecognized tax benefits including interest	1,100,000	2,200,000	3,100,000
Unrecognized tax benefits that are permanent in nature and, if recognized, would affect the annual effective tax rate	900,000	2,000,000	2,600,000
Gross unrecognized tax benefit expected to resolved	500,000
Accrued gross interest	300,000	600,000	1,200,000
Current period gross interest expense	100,000	$ 200,000	$ 300,000
Historic Tax Credit Investment
Income Tax Contingency [Line Items]
Equity method investment	23,000,000
Tax benefits from these investments	1,900,000
Historic tax credit investments amortization	2,100,000
Impact of ASC 326 adoption | Accounting Standards Update 2023-02
Income Tax Contingency [Line Items]
Retained earnings				$ 1,900,000	$ 1,900,000
Domestic Tax Authority
Income Tax Contingency [Line Items]
Operating loss carryforwards	84,700,000
Other, net	900,000
Operating loss subject to expiration	1,000
Colorado | Domestic Tax Authority
Income Tax Contingency [Line Items]
Operating loss subject to expiration	63,000,000
Valuation allowance	4,000,000
Mexico
Income Tax Contingency [Line Items]
Increased deferred tax asset valuation allowance	7,700,000
Capital loss carryforward	37,000,000
United States
Income Tax Contingency [Line Items]
Capital loss carryforward	$ 900,000