Note 6 - Contracts in Progress (Details) - Summary of Costs and Estimated Earnings on Contracts in Progress (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Summary of Costs and Estimated Earnings on Contracts in Progress [Abstract]
Costs incurred on uncompleted contracts	$ 11,107	$ 7,067
Estimated earnings	1,817	1,330
Total revenues	12,924	8,397
Less: billings to date	14,223	8,762
Total	(1,299)	(365)
Balance sheet classification:
Costs in excess of billings on uncompleted contracts	162	99
Billings in excess of costs on uncompleted contracts	$ (1,461)	$ (464)