Note 7 - Contracts in Progress (Details) - Summary of Costs and Estimated Earnings on Contracts in Progress (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Summary of Costs and Estimated Earnings on Contracts in Progress [Abstract]
Costs incurred on uncompleted contracts	$ 8,095	$ 7,347
Estimated earnings	1,954	1,603
Total revenues	10,049	8,950
Less: billings to date	10,149	9,569
Total	(100)	(619)
Balance sheet classification:
Costs and estimated earnings in excess of billings on uncompleted contracts	255	145
Billings in excess of costs and estimated earnings on uncompleted contracts	(355)	(764)
Total	$ (100)	$ (619)