Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Retained Earnings
Balance at Mar. 31, 2019	$ 104,885	$ 34,660	$ (70,459)	$ 140,684
Balance (in shares) at Mar. 31, 2019		7,910
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,466			3,466
Issuance of restricted stock awards (in shares)		39
Exercise of stock options	5	$ 5
Exercise of stock options (in shares)		2
Cancellation of restricted stock awards (in shares)		(26)
Treasury stock repurchases	(979)		(979)
Treasury stock repurchases (in shares)		(119)
Share-based compensation	202	$ 202
Balance at Mar. 31, 2020	107,579	$ 34,867	(71,438)	144,150
Balance (in shares) at Mar. 31, 2020		7,806
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,351			8,351
Issuance of restricted stock awards (in shares)		14
Treasury stock repurchases	(905)		(905)
Treasury stock repurchases (in shares)		(112)
Share-based compensation	197	$ 197
Balance at Mar. 31, 2021	$ 115,222	$ 35,064	$ (72,343)	$ 152,501
Balance (in shares) at Mar. 31, 2021		7,708