Income Taxes (Income Tax Expense Benefit) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Deferred Income Tax Expense (Benefit) [Abstract]
Deferred income tax benefit									$ 5,651,362	$ 572,914	$ (3,655,751)
Income Tax Expense (Benefit) [Abstract]
Income tax expenses (benefit)	$ 11,409,000	$ 2,418,000	$ 3,767,000	$ 5,527,000	$ 2,721,000	$ 356,000	$ 1,312,000	$ 2,363,000	23,120,599	6,751,965	15,981,057
Discontinued Operations, Disposed of by Sale
Income Tax Expense (Benefit) [Abstract]
Income tax expenses (benefit)									0	0	626,583
Continuing Operations
Current Income Tax Expense (Benefit) [Abstract]
U.S. Federal									16,443,592	3,307,872	20,508,247
State and local									1,025,645	2,871,179	(871,439)
Current income tax expense									17,469,237	6,179,051	19,636,808
Deferred Income Tax Expense (Benefit) [Abstract]
U.S. Federal									4,077,609	(224,604)	(1,833,943)
State and local									1,573,753	797,518	(1,821,808)
Deferred income tax benefit									5,651,362	572,914	(3,655,751)
Income Tax Expense (Benefit) [Abstract]
U.S. Federal									20,521,201	3,083,268	18,674,304
State and local									2,599,398	3,668,697	(2,693,247)
Income tax expenses (benefit)									$ 23,120,599	$ 6,751,965	$ 15,981,057