CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Mar. 31, 2020			7,807,834
Beginning balances at Mar. 31, 2020	$ 411,963,067	$ (21,242,249)		$ 227,214,577	$ 184,748,490	$ (21,242,249)
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Proceeds from exercise of stock options (in shares)			0
Proceeds from exercise of stock options	0
Common stock repurchases (in shares)			(326,298)
Common stock repurchases	(19,451,287)				(19,451,287)
Restricted common stock expense under stock option plan (in shares)			(29,948)
Restricted common stock expense under stock option plan	3,417,000			3,417,000
Stock option expense	1,046,735			1,046,735
Net income	15,509,649				15,509,649
Ending balance (in shares) at Jun. 30, 2020			7,451,588
Ending balances at Jun. 30, 2020	391,242,915			231,678,312	159,564,603
Beginning balance (in shares) at Mar. 31, 2021			6,805,294
Beginning balances at Mar. 31, 2021	404,927,441			255,590,674	149,336,767
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Proceeds from exercise of stock options (in shares)			23,494
Proceeds from exercise of stock options	1,808,854
Common stock repurchases (in shares)			(134,249)
Common stock repurchases	(21,082,862)				(21,082,862)
Restricted common stock expense under stock option plan (in shares)			(836)
Restricted common stock expense under stock option plan	3,102,974			3,102,974
Stock option expense	943,627			943,627
Net income	15,770,828				15,770,828
Ending balance (in shares) at Jun. 30, 2021			6,693,703
Ending balances at Jun. 30, 2021	$ 405,470,862			$ 261,446,129	$ 144,024,733