Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ 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		7,806,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock awards (in shares)		14,000
Share-based compensation	147	$ 147
Treasury stock	(748)		(748)
Treasury stock (in shares)		(94,000)
Net income	6,482			6,482
Balance at Dec. 31, 2020	113,460	$ 35,014	(72,186)	150,632
Balance (in shares) at Dec. 31, 2020		7,726,000
Balance at Sep. 30, 2020	110,144	$ 34,964	(71,667)	146,847
Balance (in shares) at Sep. 30, 2020		7,787,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock awards (in shares)		3,000
Share-based compensation	50	$ 50
Treasury stock	(519)		(519)
Treasury stock (in shares)		(64,000)
Net income	3,785			3,785
Balance at Dec. 31, 2020	113,460	$ 35,014	(72,186)	150,632
Balance (in shares) at Dec. 31, 2020		7,726,000
Balance at Mar. 31, 2021	115,222	$ 35,064	(72,343)	152,501
Balance (in shares) at Mar. 31, 2021		7,708,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock awards (in shares)		17,000
Exercise of stock options	28	$ 28
Exercise of stock options, shares		3,000
Share-based compensation	152	$ 152
Treasury stock	(1,617)		(1,617)
Treasury stock (in shares)		(143,000)
Net income	2,630			2,630
Balance at Dec. 31, 2021	116,415	$ 35,244	(73,960)	155,131
Balance (in shares) at Dec. 31, 2021		7,585,000
Balance at Sep. 30, 2021	117,089	$ 35,151	(73,895)	155,833
Balance (in shares) at Sep. 30, 2021		7,583,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted stock awards (in shares)		5,000
Exercise of stock options	28	$ 28
Exercise of stock options, shares		3,000
Share-based compensation	65	$ 65
Treasury stock	(65)		(65)
Treasury stock (in shares)		(6,000)
Net income	(702)			(702)
Balance at Dec. 31, 2021	$ 116,415	$ 35,244	$ (73,960)	$ 155,131
Balance (in shares) at Dec. 31, 2021		7,585,000