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Note 6 - Contracts in Progress (Detail) - Summary of Costs and Estimated Earnings on Contracts in Progress (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Costs incurred on uncompleted contracts $ 8,494 $ 7,067
Estimated earnings 1,681 1,330
Total revenues 10,175 8,397
Less: billings to date 10,265 8,762
Total (90) (365)
Balance sheet classification:    
Costs in excess of billings on uncompleted contracts 97 99
Billings in excess of costs on uncompleted contracts $ (187) $ (464)