Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Sales	$ 117,153	$ 104,568	$ 263,762	$ 260,273
Costs and expenses
Cost of sales	80,175	69,380	182,887	174,852
Selling, general and administrative expenses	22,496	19,967	60,991	57,367
Gain on bargain purchases	(19,711)	0	(20,087)	0
Interest expense (income), net	86	39	(7)	(43)
Other income, net	(110)	(9)	(212)	(9)
Total costs and expenses	82,936	89,377	223,572	232,167
Income before income taxes	34,217	15,191	40,190	28,106
Income tax expense	4,248	5,527	6,515	10,281
Net income	$ 29,969	$ 9,664	$ 33,675	$ 17,825
Net income per common share:
Basic (in dollars per share)	$ 3.30	$ 1.07	$ 3.71	$ 1.94
Diluted (in dollars per share)	$ 3.29	$ 1.06	$ 3.70	$ 1.92
Weighted average shares outstanding:
Basic (in shares)	9,082	9,037	9,070	9,175
Diluted (in shares)	9,118	9,126	9,113	9,271
Cash dividends per share of common stock (in dollars per share)	$ 0.2	$ 0.18	$ 0.6	$ 0.54
Comprehensive income:
Net income	$ 29,969	$ 9,664	$ 33,675	$ 17,825
Foreign currency translation adjustments	(204)	0	(204)	0
Comprehensive income	$ 29,765	$ 9,664	$ 33,471	$ 17,825