Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 101,397	$ 101,291	$ 149,721	$ 146,609
Cost of sales	74,722	69,691	111,234	102,712
Gross profit	26,675	31,600	38,487	43,897
Selling, general and administrative expenses	23,282	20,921	43,978	38,495
Operating income (loss)	3,393	10,679	(5,491)	5,402
Gain on bargain purchase	0	(376)	0	(376)
Interest expense (income), net	47	(4)	(7)	(93)
Other expense (income), net	(169)	(11)	(328)	(102)
Income (loss) before income taxes	3,515	11,070	(5,156)	5,973
Income tax expense (benefit)	502	4,078	(1,105)	2,267
Net income (loss)	$ 3,013	$ 6,992	$ (4,051)	$ 3,706
Weighted average shares outstanding:
Basic (shares)	9,109	9,076	9,099	9,065
Diluted (shares)	9,143	9,107	9,099	9,111
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.33	$ 0.77	$ (0.45)	$ 0.41
Diluted (in dollars per share)	0.33	0.77	(0.45)	0.41
Cash dividends per share of common stock (in dollars per share)	$ 0.2	$ 0.2	$ 0.40	$ 0.40
Comprehensive income (loss):
Net income (loss)	$ 3,013	$ 6,992	$ (4,051)	$ 3,706
Currency translation adjustment	302	0	610	0
Comprehensive income (loss)	$ 3,315	$ 6,992	$ (3,441)	$ 3,706