Condensed Consolidated Statements of Shareholders' Equity - USD ($)	Common stock	Treasury stock	Additional paid-in capital	Retained earnings	Total
Balance at Mar. 31, 2018	$ 586,402	$ (35,223,428)	$ 858,109,882	$ 135,940,506	$ 959,413,362
Balance (in shares) at Mar. 31, 2018	58,640,161
Increase (Decrease) in Shareholders' Equity
Net (loss)/income for the period				(20,596,558)	(20,596,558)
Restricted share award issuances	$ 2,095		(2,095)
Restricted share award issuances (in shares)	209,552
Stock-based compensation			1,632,538		1,632,538
Purchase of treasury stock		(1,133,018)			(1,133,018)
Balance at Jun. 30, 2018	$ 588,497	(36,356,446)	859,740,325	115,343,948	939,316,324
Balance (in shares) at Jun. 30, 2018	58,849,713
Balance at Mar. 31, 2019	$ 588,826	(36,484,561)	863,583,692	84,994,601	912,682,558
Balance (in shares) at Mar. 31, 2019	58,882,515
Increase (Decrease) in Shareholders' Equity
Net (loss)/income for the period				6,075,059	6,075,059
Restricted share award issuances	$ 78		(78)
Restricted share award issuances (in shares)	7,750
Stock-based compensation			1,305,827		1,305,827
Purchase of treasury stock		(983,582)			(983,582)
Balance at Jun. 30, 2019	$ 588,904	$ (37,468,143)	$ 864,889,441	$ 91,069,660	$ 919,079,862
Balance (in shares) at Jun. 30, 2019	58,890,265