Condensed Consolidated Statements of Shareholders' Equity Statement - USD ($) shares in Thousands, $ in Thousands	Total	Capital in excess of stated value	Capital in excess of stated value	Capital in excess of stated value	Capital in excess of stated value	Capital in excess of stated value
Beginning balance at Mar. 31, 2018	$ 108,431	$ 9,482	$ (2,486)	$ (1,911)	$ 103,601	$ (255)
Beginning balance (in shares) at Mar. 31, 2018		31,607	(8,283)
Cumulative effect of change in accounting policy	2,614				2,614
Share-based compensation	1,721			1,721
Restricted shares issued, net			$ 51	(51)
Restricted shares issued, net (in shares)			168
Shares issued upon exercise of SSARs			$ 15	(15)
Shares issued upon exercise of SSARs (in shares)			51
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(199)		$ (4)	(195)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(13)
Net loss	(5,528)				(5,528)
Unrealized translation adjustments	(65)					(65)
Ending balance at Sep. 30, 2018	106,974	$ 9,482	$ (2,424)	(451)	100,687	(320)
Ending balance (in shares) at Sep. 30, 2018		31,607	(8,077)
Beginning balance at Jun. 30, 2018	109,749	$ 9,482	$ (2,425)	(1,524)	104,478	(262)
Beginning balance (in shares) at Jun. 30, 2018		31,607	(8,080)
Share-based compensation	1,129			1,129
Restricted shares issued, net			$ (1)	1
Restricted shares issued, net (in shares)			(4)
Shares issued upon exercise of SSARs			$ 3	(3)
Shares issued upon exercise of SSARs (in shares)			10
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(55)		$ (1)	(54)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(3)
Net loss	(3,791)				(3,791)
Unrealized translation adjustments	(58)					(58)
Ending balance at Sep. 30, 2018	106,974	$ 9,482	$ (2,424)	(451)	100,687	(320)
Ending balance (in shares) at Sep. 30, 2018		31,607	(8,077)
Beginning balance at Mar. 31, 2019	100,622	$ 9,482	$ (2,433)	781	93,051	(259)
Beginning balance (in shares) at Mar. 31, 2019		31,607	(8,105)
Share-based compensation	2,295			2,295
Restricted shares issued, net			$ 43	(43)
Restricted shares issued, net (in shares)			144
Shares issued upon exercise of SSARs			$ 5	(5)
Shares issued upon exercise of SSARs (in shares)			17
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(120)		$ (1)	(119)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(5)
Net loss	(4,493)				(4,493)
Unrealized translation adjustments	61					61
Ending balance at Sep. 30, 2019	98,365	$ 9,482	$ (2,386)	2,909	88,558	(198)
Ending balance (in shares) at Sep. 30, 2019		31,607	(7,949)
Beginning balance at Jun. 30, 2019	99,923	$ 9,482	$ (2,379)	1,698	91,476	(354)
Beginning balance (in shares) at Jun. 30, 2019		31,607	(7,927)
Share-based compensation	1,228			1,228
Restricted shares issued, net			$ (8)	8
Restricted shares issued, net (in shares)			(24)
Shares issued upon exercise of SSARs			$ 1	(1)
Shares issued upon exercise of SSARs (in shares)			3
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(24)		$ 0	(24)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(1)
Net loss	(2,918)				(2,918)
Unrealized translation adjustments	156					156
Ending balance at Sep. 30, 2019	$ 98,365	$ 9,482	$ (2,386)	$ 2,909	$ 88,558	$ (198)
Ending balance (in shares) at Sep. 30, 2019		31,607	(7,949)