Condensed Consolidated Statements of Shareholders Equity - USD ($)	Common stock	Treasury stock	Additional paid-in capital	Retained earnings	Total
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				12,168,005	12,168,005
Restricted share award issuances	$ 3,516		(3,516)
Restricted share award issuances (in shares)	351,629
Stock-based compensation			1,930,902		1,930,902
Purchase of treasury stock		(1,198,214)			(1,198,214)
Balance at Jun. 30, 2020	$ 594,349	(88,382,079)	868,736,757	209,003,864	989,952,891
Balance (in shares) at Jun. 30, 2020	59,434,919
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				5,869,100	5,869,100
Restricted share award issuances	$ 158		(158)
Restricted share award issuances (in shares)	15,800
Stock-based compensation			647,124		647,124
Purchase of treasury stock		(14,793,180)			(14,793,180)
Balance at Jun. 30, 2021	$ 510,873	$ (114,655,294)	$ 757,423,183	$ 295,269,612	$ 938,548,374
Balance (in shares) at Jun. 30, 2021	51,087,209