CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 95,974	$ 112,901	$ 153,511	$ 177,028
Cost of sales	71,255	88,220	116,686	140,700
Gross profit	24,719	24,681	36,825	36,328
Selling, general and administrative expenses	20,439	28,348	43,486	57,277
Restructuring expenses	741	2,127	2,795	2,127
Impairment of goodwill	0	0	0	1,390
Operating income (loss)	3,539	(5,794)	(9,456)	(24,466)
Interest expense (income), net	721	434	1,649	696
Other expense (income), net	(989)	(166)	(1,076)	(283)
Income (loss) before income taxes	3,807	(6,062)	(10,029)	(24,879)
Income tax expense (benefit)	325	(1,152)	737	(1,493)
Net income (loss)	$ 3,482	$ (4,910)	$ (10,766)	$ (23,386)
Net income (loss) per common share, basic (in dollars per share)	$ 0.39	$ (0.54)	$ (1.22)	$ (2.57)
Net income (loss) per common share, diluted (in dollars per share)	$ 0.39	$ (0.54)	$ (1.22)	$ (2.57)
Weighted average basic shares outstanding (in shares)	8,875	9,057	8,857	9,088
Weighted average diluted shares outstanding (in shares)	8,892	9,057	8,857	9,088
Net income (loss)	$ 3,482	$ (4,910)	$ (10,766)	$ (23,386)
Currency translation adjustments:
Currency translation adjustments	(304)	(246)	(519)	(966)
Total currency translation gain (loss)	(304)	(246)	(519)	(966)
Interest rate swap agreement:
Fair value adjustment, net of tax $124 for the three months, and $183 for the six months ended September 30, 2018	0	211	0	476
Total effects of interest rate swap agreement	0	211	0	476
Other comprehensive income (loss), net:	(304)	(35)	(519)	(490)
Comprehensive income (loss)	$ 3,178	$ (4,945)	$ (11,285)	$ (23,876)