CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
NET SALES	$ 181,158	$ 128,529	$ 351,070	$ 304,583
COSTS OF OPERATIONS	160,568	110,802	314,649	268,318
GROSS PROFIT	20,590	17,727	36,421	36,265
OPERATING EXPENSES:
Selling, general and administrative expenses	12,019	10,067	23,070	21,041
NON-OPERATING (INCOME) EXPENSES:
Interest expense, net	340	429	615	788
Other (income) expense, net	(48)	(275)	228	(184)
Total expense, net	12,311	10,221	23,913	21,645
INCOME BEFORE INCOME TAXES	8,279	7,506	12,508	14,620
INCOME TAX PROVISION	1,763	1,680	2,814	3,363
NET INCOME	$ 6,516	$ 5,826	$ 9,694	$ 11,257
Basic Income Per Share (in dollars per share)	$ 0.57	$ 0.51	$ 0.85	$ 0.99
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.18	$ 0.18	$ 0.36	$ 0.36
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic (in shares)	11,411	11,405	11,411	11,405