Earnings Per Share (EPS) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income	$ 35,383,230	$ 16,580,885	$ 14,101,803	$ 5,869,100	$ 44,033,434	$ 35,825,264	$ 537,950	$ 12,168,005	$ 71,935,018	$ 92,564,653	$ 111,841,258
Denominator:
Basic weighted average number of common shares outstanding (in shares)									40,203,937	49,729,358	53,881,483
Effect of dilutive restricted stock and restricted stock units (in shares)									161,151	97,440	233,855
Diluted weighted average number of common shares outstanding (in shares)									40,365,088	49,826,798	54,115,338
EPS:
Earnings per common share - basic (in dollars per share)	$ 0.89	$ 0.42	$ 0.35	$ 0.14	$ 0.93	$ 0.71	$ 0.01	$ 0.24	$ 1.79	$ 1.86	$ 2.08
Earnings per common share - diluted (in dollars per share)	$ 0.88	$ 0.41	$ 0.35	$ 0.14	$ 0.93	$ 0.71	$ 0.01	$ 0.24	$ 1.78	$ 1.86	$ 2.07
Restricted stock awards
EPS:
Number of shares excluded from the calculation of diluted EPS									0	0	0