Note 6 - Contracts in Progress (Details) - Summary of Costs and Estimated Earnings on Contracts in Progress (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Summary of Costs and Estimated Earnings on Contracts in Progress [Abstract]
Costs incurred on uncompleted contracts	$ 9,067	$ 7,067
Estimated earnings	1,432	1,330
Total revenues	10,499	8,397
Less: billings to date	10,691	8,762
Total	(192)	(365)
Balance sheet classification:
Costs in excess of billings on uncompleted contracts	127	99
Billings in excess of costs on uncompleted contracts	$ (319)	$ (464)