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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Contract revenues	$ 300,129	$ 253,634
Contract costs	274,389	226,353
Gross profit	25,740	27,281
Selling, general and administrative expenses	25,779	23,859
Amortization of intangible assets	188	211
Gain on sale of property and equipment	(707)	(96)
Income from operations	480	3,307
Other income (expense):
Interest income	1	4
Interest expense	(514)	(183)
Other income, net	874	108
Income before provision for income taxes	841	3,236
Income tax expense (benefit)	(359)	1,249
Net income	$ 1,200	$ 1,987
Income per common share:
- Basic (in dollars per share)	$ 0.07	$ 0.1
- Diluted (in dollars per share)	$ 0.07	$ 0.1
Weighted average number of common shares and potential common shares outstanding:
- Basic (in shares)	16,161	19,321
- Diluted (in shares)	16,452	19,634
Net income	$ 1,200	$ 1,987
Other comprehensive loss:
Foreign currency translation adjustment	(49)	(81)
Other comprehensive loss	(49)	(81)
Total comprehensive income	$ 1,151	$ 1,906

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration