Consolidated Statements of Shareholders Equity - USD ($)	Common stock	Treasury stock	Additional paid-in capital	Retained earnings/(Accumulated deficit)	Total
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 income for the period				111,841,258	111,841,258
Restricted share award issuances	$ 2,007		(2,007)
Restricted share award issuances (in shares)	200,775
Stock-based compensation			3,227,686		3,227,686
Purchase of treasury stock		(50,699,304)			(50,699,304)
Balance at Mar. 31, 2020	$ 590,833	(87,183,865)	866,809,371	196,835,859	977,052,198
Balance (in shares) at Mar. 31, 2020	59,083,290
Increase (Decrease) in Shareholders' Equity
Net income for the period				92,564,653	92,564,653
Restricted share award issuances	$ 3,933		(3,933)
Restricted share award issuances (in shares)	393,265
Stock-based compensation			3,356,199		3,356,199
Repurchase and cancellation of common stock	$ (84,051)		(113,385,420)		(113,469,471)
Repurchase and cancellation of common stock (in shares)	(8,405,146)
Purchase of treasury stock		(12,678,249)			(12,678,249)
Balance at Mar. 31, 2021	$ 510,715	(99,862,114)	756,776,217	289,400,512	946,825,330
Balance (in shares) at Mar. 31, 2021	51,071,409
Increase (Decrease) in Shareholders' Equity
Net income for the period				71,935,018	71,935,018
Restricted share award issuances	$ 2,502		(2,502)
Restricted share award issuances (in shares)	250,286
Dividend				(80,576,390)	(80,576,390)
Stock-based compensation			3,332,279		3,332,279
Purchase of treasury stock		(21,364,822)			(21,364,822)
Balance at Mar. 31, 2022	$ 513,217	$ (121,226,936)	$ 760,105,994	$ 280,759,140	$ 920,151,415
Balance (in shares) at Mar. 31, 2022	51,321,695