Condensed Consolidated Statements of Shareholders' Equity - USD ($)	Common stock	Treasury stock	Additional paid-in capital	Retained earnings/(Accumulated deficit)	Total
Balance at Mar. 31, 2016	$ 580,575	$ (20,943,816)	$ 848,179,471	$ 157,783,007	$ 985,599,237
Balance (in shares) at Mar. 31, 2016	58,057,493
Increase (Decrease) in Shareholders' Equity
Net loss				(8,436,709)	(8,436,709)
Restricted share award issuances	$ 2,671		(2,671)
Restricted share award issuances (in shares)	267,080
Stock-based compensation			2,489,642		2,489,642
Purchase of treasury stock		(12,853,465)			(12,853,465)
Balance at Sep. 30, 2016	$ 583,246	(33,797,281)	850,666,442	149,346,298	966,798,705
Balance (in shares) at Sep. 30, 2016	58,324,573
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