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Note 2 - Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Costs in Excess of Billings, Noncurrent $ 17,600,000    
Increase (Decrease) in Estimated Gross Profits on Contracts Due to Revisions $ (1,875,000) $ (42,568,000) $ (3,700,000)