Consolidated Statements of Shareholders' Equity - USD ($)	Common stock	Treasury stock	Additional paid-in capital	Retained earnings/(Accumulated deficit)	Total
Balance at Mar. 31, 2014	$ 483,650		$ 688,881,939	$ 2,833,843	$ 692,199,432
Balance (in shares) at Mar. 31, 2014	48,365,011
Increase (Decrease) in Shareholders' Equity
Net income/(loss)				25,260,782	25,260,782
Restricted share award issuances	$ 9,290		(9,290)
Restricted share award issuances (in shares)	929,000
Stock-based compensation			2,311,565		2,311,565
Balance at Mar. 31, 2015	$ 580,575		844,539,059	28,094,625	873,214,259
Balance (in shares) at Mar. 31, 2015	58,057,493
Increase (Decrease) in Shareholders' Equity
Net income/(loss)				129,688,382	129,688,382
Stock-based compensation			3,640,412		3,640,412
Purchase of treasury stock		$ (20,943,816)			(20,943,816)
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 income/(loss)				(1,441,815)	(1,441,815)
Restricted share award issuances	$ 2,847		(2,847)
Restricted share award issuances (in shares)	284,708
Stock-based compensation			4,797,749		4,797,749
Purchase of treasury stock		(12,953,453)			(12,953,453)
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