Income Taxes (Income Tax Reconciliation) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Income tax expense reconciliation to U.S. federal tax rate [Abstract]
Expected income tax									$ 20,875,624	$ 5,700,613	$ 13,771,657
Increase (reduction) in income taxes resulting from:
State tax (excluding state tax credits), net of federal benefit									3,513,226	328,026	1,489,800
Federal tax credits, net									(1,034,091)	(200,203)	(1,193,021)
State tax credits									(239,410)	(162,619)	(470,916)
Uncertain tax positions									(16,802)	(1,151,234)	(555,252)
Expiration of capital loss carryforward									7,773,559	0	0
Executive compensation limitation under Section 162(m)									62,686	732,504	1,918,618
Excess tax benefits related to equity compensation									(347,806)	(73,644)	(3,237,682)
Decrease in valuation allowance related to capital loss carryforward									(7,773,559)	0	0
Prior year adjustments									(1,135,270)	238,187	(51,728)
Other, net									384,352	502,153	(11,994)
Income tax expenses (benefit)	$ 11,555,000	$ 2,853,000	$ 4,839,000	$ 2,816,000	$ 5,430,000	$ 2,097,000	$ 549,000	$ (2,162,000)	$ 22,062,509	$ 5,913,783	$ 11,659,482