Condensed Consolidated Statements of Shareholders' Equity Statement - USD ($) shares in Thousands, $ in Thousands	Total	Common Shares	Treasury Shares	Capital in excess of stated value	Retained earnings	Accumulated other comprehensive loss
Beginning balance (in shares) at Mar. 31, 2018		31,607	(8,283)
Beginning balance at Mar. 31, 2018	$ 108,431	$ 9,482	$ (2,486)	$ (1,911)	$ 103,601	$ (255)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	592			592
Restricted shares issued, net (in shares)			172
Restricted shares issued, net	0		$ 52	(52)
Shares issued upon exercise of stock options and SSARs (in shares)			41
Shares issued upon exercise of stock options and SSARs	0		$ 12	(12)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(10)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(144)		$ (3)	(141)
Net loss	(1,736)				(1,736)
Unrealized translation adjustments	(8)					(8)
Ending balance (in shares) at Jun. 30, 2018		31,607	(8,080)
Ending balance at Jun. 30, 2018	109,749	$ 9,482	$ (2,425)	(1,524)	104,479	(263)
Beginning balance (in shares) at Mar. 31, 2019		31,607	(8,105)
Beginning balance at Mar. 31, 2019	100,622	$ 9,482	$ (2,433)	781	93,051	(259)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	1,067			1,067
Restricted shares issued, net (in shares)			168
Restricted shares issued, net	0		$ 51	(51)
Shares issued upon exercise of stock options and SSARs (in shares)			14
Shares issued upon exercise of stock options and SSARs	0		$ 4	(4)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(4)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(96)		$ (1)	(95)
Net loss	(1,575)				(1,575)
Unrealized translation adjustments	(95)					(95)
Ending balance (in shares) at Jun. 30, 2019		31,607	(7,927)
Ending balance at Jun. 30, 2019	$ 99,923	$ 9,482	$ (2,379)	$ 1,698	$ 91,476	$ (354)