CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 130,642	$ 117,153	$ 280,363	$ 263,762
Cost of sales	93,183	80,175	204,417	182,887
Gross profit	37,459	36,978	75,946	80,875
Selling, general and administrative expenses	29,138	22,496	73,116	60,991
Operating income	8,321	14,482	2,830	19,884
Gain on bargain purchase	0	(19,711)	0	(20,087)
Interest expense (income), net	344	86	337	(7)
Other expense (income), net	99	(110)	(229)	(212)
Income before income taxes	7,878	34,217	2,722	40,190
Income tax expense	1,926	4,248	821	6,515
Net income	$ 5,952	$ 29,969	$ 1,901	$ 33,675
Weighted average shares outstanding:
Basic (shares)	9,116	9,082	9,105	9,070
Diluted (shares)	9,157	9,118	9,142	9,113
Net income per common share:
Basic (in dollars per share)	$ 0.65	$ 3.30	$ 0.21	$ 3.71
Diluted (in dollars per share)	0.65	3.29	0.21	3.70
Cash dividends per share of common stock (in dollars per share)	$ 0.2	$ 0.2	$ 0.6	$ 0.6
Comprehensive income:
Net income	$ 5,952	$ 29,969	$ 1,901	$ 33,675
Currency translation adjustment	(44)	(204)	566	(204)
Comprehensive income	$ 5,908	$ 29,765	$ 2,467	$ 33,471