4. BILLINGS, COSTS AND ESTIMATED EARNINGS ON UNCOMPLETED CONTRACTS (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Billings In Excess Of Costs And Estimated Earnings On Uncompleted Contracts And Deferred Revenues
Costs incurred on uncompleted contracts	$ 6,378	$ 3,220
Estimated earnings on uncompleted contracts	3,807	2,282
Gross costs and estimated earnings	10,185	5,502
Less: Billings to date on uncompleted contracts	(11,175)	(4,194)
Costs incurred plus estimated earning less billings on uncompleted contracts	(990)	1,308
Included in the accompanying condensed consolidated balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts	2,274	1,354
Billings in excess of costs and estimated earnings on uncompleted contracts	(3,264)	(46)
Total costs and estimated earnings and billings in excess of cost on uncompleted contracts	$ (990)	$ 1,308