Condensed Consolidated Statements of Shareholders' Equity - USD ($)	Common stock	Treasury stock	Additional paid-in capital	Retained earnings	Total
Balance at Mar. 31, 2017	$ 583,422	$ (33,897,269)	$ 852,974,373	$ 156,341,192	$ 976,001,718
Balance (in shares) at Mar. 31, 2017	58,342,201
Increase (Decrease) in Shareholders' Equity
Net loss				(6,689,970)	(6,689,970)
Restricted share award issuances	$ 2,685		(2,685)
Restricted share award issuances (in shares)	268,464
Stock-based compensation			1,524,217		1,524,217
Purchase of treasury stock		(1,084,902)			(1,084,902)
Balance at Jun. 30, 2017	$ 586,107	(34,982,171)	854,495,905	149,651,222	969,751,063
Balance (in shares) at Jun. 30, 2017	58,610,665
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				(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