UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 367,157	$ 298,503
Cost of sales	289,564	230,839
Gross profit	77,593	67,664
Selling, general, and administrative expenses	54,664	48,054
Depreciation and amortization	2,063	1,775
Interest and financing costs	359	349
Operating expenses	57,086	50,178
Operating income	20,507	17,486
Other income	271	0
Earnings before tax	20,778	17,486
Provision for income taxes	7,355	6,815
Net earnings	$ 13,423	$ 10,671
Net earnings per common share-basic (in dollars per share)	$ 0.97	$ 0.76
Net earnings per common share-diluted (in dollars per share)	$ 0.96	$ 0.75
Weighted average common shares outstanding-basic (in shares)	13,806	14,066
Weighted average common shares outstanding-diluted (in shares)	14,019	14,216