CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
NET SALES	$ 148,815	$ 126,788
COSTS OF OPERATIONS	135,845	114,836
GROSS PROFIT	12,970	11,952
OPERATING EXPENSES:
Selling, general and administrative expenses	8,010	7,440
Interest expense, net	198	163
Other (income) expense, net	(341)	56
Total operating expenses	7,867	7,659
INCOME BEFORE INCOME TAXES	5,103	4,293
INCOME TAX PROVISION	1,743	1,229
NET INCOME	$ 3,360	$ 3,064
BASIC INCOME PER COMMON SHARE (in dollars per share)	$ 0.30	$ 0.27
DILUTED INCOME PER COMMON SHARE (in dollars per share)	0.30	0.27
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.17	$ 0.16
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic (in shares)	11,345	11,315
Diluted (in shares)	11,373	11,367