2. BILLINGS, COSTS AND ESTIMATED EARNINGS ON UNCOMPLETED CONTRACTS (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Billings In Excess Of Costs And Estimated Earnings On Uncompleted Contracts And Deferred Revenues
Costs incurred on uncompleted contracts	$ 7,956	$ 8,858
Estimated earnings on uncompleted contracts	8,231	6,777
Gross costs and estimated earnings	16,187	15,635
Less: Billings to date on uncompleted contracts	(16,600)	(17,907)
Costs incurred plus estimated earning less billings on uncompleted contracts	(413)	(2,272)
Included in the accompanying condensed consolidated balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts	187	1,077
Billings in excess of costs and estimated earnings on uncompleted contracts	(600)	(3,349)
Total costs and estimated earnings and billings in excess of cost on uncompleted contracts	$ (413)	$ (2,272)