4. BILLINGS, COSTS AND ESTIMATED EARNINGS ON UNCOMPLETED CONTRACTS (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Billings In Excess Of Costs And Estimated Earnings On Uncompleted Contracts And Deferred Revenues
Costs incurred on uncompleted contracts	$ 12,979	$ 10,500
Estimated earnings on uncompleted contracts	4,841	3,893
Gross costs and estimated earnings	17,820	14,393
Less: Billings to date on uncompleted contracts	(12,508)	(7,585)
Costs incurred plus estimated earning less billings on uncompleted contracts	5,312	6,808
Included in the accompanying condensed consolidated balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts	5,946	6,808
Billings in excess of costs and estimated earnings on uncompleted contracts	(634)	0
Total costs and estimated earnings and billings in excess of cost on uncompleted contracts	$ 5,312	$ 6,808