UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 298,503	$ 269,866
Cost of sales	230,839	210,736
Gross profit	67,664	59,130
Professional and other fees	1,786	1,518
Salaries and benefits	39,798	35,214
General and administrative expenses	6,470	5,571
Depreciation and amortization	1,775	1,208
Interest and financing costs	349	553
Operating expenses	50,178	44,064
Earnings before tax	17,486	15,066
Provision for income taxes	6,815	6,252
Net earnings	$ 10,671	$ 8,814
Net earnings per common share-basic (In dollars per share)	$ 1.52	$ 1.22
Net earnings per common share-diluted (In dollars per share)	$ 1.50	$ 1.21
Weighted average common shares outstanding-basic (In shares)	7,033	7,225
Weighted average common shares outstanding-diluted (In shares)	7,108	7,301