Organization, Business and Basis of Presentation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Organization Consolidation and Presentation of Financial Statements [Line Items]
Operating Income (Loss)	$ 11,139	$ 9,919	$ 23,588	$ 34,540
Net Income (Loss) Attributable to Parent	$ 6,146	$ 6,175	$ 13,633	$ 21,421
Earnings Per Share, Diluted	$ 0.38	$ 0.29	$ 0.77	$ 1.01
Foreign Currency Transaction Gain (Loss), Realized	$ (300)		$ (100)
Bank Overdrafts	$ 2,500		$ 2,500
Contracts Accounted for under Percentage of Completion [Member] | Cost Estimate Revision [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Cost Estimate Revision Gross Margin Increase (Decrease) Percentage	0.70%	(0.50%)	(0.50%)	0.50%
Estimate Adjustment [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Operating Income (Loss)	$ 2,000	$ (1,300)	$ (3,600)	$ 3,500
Net Income (Loss) Attributable to Parent	$ 1,200	$ (800)	$ (2,200)	$ 2,200
Earnings Per Share, Diluted	$ 0.07	$ (0.04)	$ (0.12)	$ 0.10