4. BILLINGS IN EXCESS OF COSTS AND ESTIMATED EARNINGS (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Billings In Excess Of Costs And Estimated Earnings On Uncompleted Contracts And Deferred Revenues
Costs incurred on uncompleted contracts	$ 728	$ 473
Estimated earnings on uncompleted contracts	489	179
Total earnings on umcompleted contracts	1,217	652
Less: Billings to date on uncompleted contracts	(2,327)	(2,335)
Costs in Excess of Billings, Net	(1,110)	(1,683)
Included in the accompanying condensed consolidated balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts	327	84
Billings in excess of costs and estimated earnings on uncompleted contracts	(1,437)	(1,767)
Costs in Excess of Billings, Net	$ (1,110)	$ (1,683)