Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Retained Earnings
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]
Issuance of restricted stock awards (in shares)		11
Share-based compensation	97	$ 97
Treasury stock	(229)		(229)
Treasury stock (in shares)		(30)
Net income	2,697			2,697
Balance at Sep. 30, 2020	110,144	$ 34,964	(71,667)	146,847
Balance (in shares) at Sep. 30, 2020		7,787
Balance at Jun. 30, 2020	109,030	$ 34,916	(71,466)	145,580
Balance (in shares) at Jun. 30, 2020		7,802
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock awards (in shares)		10
Share-based compensation	48	$ 48
Treasury stock	(201)		(201)
Treasury stock (in shares)		(25)
Net income	1,267			1,267
Balance at Sep. 30, 2020	110,144	$ 34,964	(71,667)	146,847
Balance (in shares) at Sep. 30, 2020		7,787
Balance at Mar. 31, 2021	115,222	$ 35,064	(72,343)	152,501
Balance (in shares) at Mar. 31, 2021		7,708
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock awards (in shares)		12
Share-based compensation	87	$ 87
Treasury stock	(1,552)		(1,552)
Treasury stock (in shares)		(137)
Net income	3,332			3,332
Balance at Sep. 30, 2021	117,089	$ 35,151	(73,895)	155,833
Balance (in shares) at Sep. 30, 2021		7,583
Balance at Jun. 30, 2021	116,332	$ 35,110	(73,008)	154,230
Balance (in shares) at Jun. 30, 2021		7,650
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock awards (in shares)		10
Share-based compensation	41	$ 41
Treasury stock	(887)		(887)
Treasury stock (in shares)		(77)
Net income	1,603			1,603
Balance at Sep. 30, 2021	$ 117,089	$ 35,151	$ (73,895)	$ 155,833
Balance (in shares) at Sep. 30, 2021		7,583