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				(18,605,106)	(18,605,106)
Restricted share award issuances	$ 2,785		(2,785)
Restricted share award issuances (in shares)	278,526
Stock-based compensation			2,699,788		2,699,788
Purchase of treasury stock		(1,084,902)			(1,084,902)
Balance at Sep. 30, 2017	$ 586,207	(34,982,171)	855,671,376	137,736,086	959,011,498
Balance (in shares) at Sep. 30, 2017	58,620,727
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				(28,773,678)	(28,773,678)
Restricted share award issuances	$ 2,193		(2,193)
Restricted share award issuances (in shares)	219,134
Stock-based compensation			2,957,399		2,957,399
Purchase of treasury stock		(1,133,018)			(1,133,018)
Balance at Sep. 30, 2018	$ 588,595	$ (36,356,446)	$ 861,065,088	$ 107,166,828	$ 932,464,065
Balance (in shares) at Sep. 30, 2018	58,859,295