Consolidated Statements of Shareholders' Equity (Unaudited) - 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]
Issuance of restricted stock awards (in shares)		40
Cancellation of restricted stock awards (in shares)		(25)
Share-based compensation	89	$ 89
Common stock repurchases	$ 0
Common stock repurchases (in shares)	0
Net income	$ 859			859
Balance at Sep. 30, 2019	105,833	$ 34,749	(70,459)	141,543
Balance (in shares) at Sep. 30, 2019		7,925
Balance at Jun. 30, 2019	105,510	$ 34,694	(70,459)	141,275
Balance (in shares) at Jun. 30, 2019		7,928
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock awards (in shares)		21
Cancellation of restricted stock awards (in shares)		(24)
Share-based compensation	55	$ 55
Common stock repurchases	$ 0
Common stock repurchases (in shares)	0
Net income	$ 268			268
Balance at Sep. 30, 2019	105,833	$ 34,749	(70,459)	141,543
Balance (in shares) at Sep. 30, 2019		7,925
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
Common stock repurchases	$ (229)		(229)
Common stock repurchases (in shares)	(30)	(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
Common stock repurchases	$ (201)		(201)
Common stock repurchases (in shares)	(25)	(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