CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
NET SALES	$ 197,213	$ 159,160
COSTS OF OPERATIONS	174,616	140,733
GROSS PROFIT	22,597	18,427
OPERATING EXPENSES:
Selling, general and administrative expenses	10,215	9,589
NON-OPERATING (INCOME) EXPENSES:
Interest expense, net	668	420
Other (income) expense, net	254	(915)
Total expense, net	11,137	9,094
INCOME BEFORE INCOME TAXES	11,460	9,333
INCOME TAX PROVISION	2,800	2,663
NET INCOME	$ 8,660	$ 6,670
BASIC INCOME PER COMMON SHARE (in dollars per share)	$ 0.76	$ 0.59
DILUTED INCOME PER COMMON SHARE (in dollars per share)	0.76	0.59
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.18	$ 0.18
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic (in shares)	11,400	11,384
Diluted (in shares)	11,400	11,393