Earnings Per Share ("EPS") (Details) - USD ($)	3 Months Ended				6 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net income	$ 537,950	$ 12,168,005	$ 40,711,896	$ 6,075,059	$ 12,705,955	$ 46,786,955
Denominator:
Basic weighted average number of common shares outstanding (in shares)	50,711,714		54,646,451		50,632,392	54,599,978
Effect of dilutive restricted stock and restricted stock units (in shares)	42,793		117,183		83,785	225,205
Diluted weighted average number of common shares outstanding (in shares)	50,754,507		54,763,634		50,716,177	54,825,183
EPS:
Basic (in dollars per share)	$ 0.01		$ 0.75		$ 0.25	$ 0.86
Diluted (in dollars per share)	$ 0.01		$ 0.74		$ 0.25	$ 0.85
Restricted stock awards
EPS:
Number of shares excluded from the calculation of diluted EPS	0		0		0	0