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Note 1 - Summary of Business and Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Apr. 03, 2017
Dec. 31, 2016
Ownership Interest in Joint Venture 50.00%      
Costs and Estimated Earnings in Excess of Billings [Member]        
Unapproved Change Orders, Amount $ 400,000     $ 2,200,000
Contracts Receivable, Claims and Uncertain Amounts 10,300,000     9,200,000
Contracts Receivable, Unpaid Project Contract Price 3,900,000     $ 3,900,000
Operating Income (Loss) [Member]        
Estimated Construction Gross (Loss) Profit, Before Tax $ 800,000 $ (1,200,000)    
Minimum [Member]        
Ownership Interest in Joint Venture 50.00%      
Revenue Recognition Percentage of Completion Range 1 year      
Warranty Term 1 year      
Maximum [Member]        
Revenue Recognition Percentage of Completion Range 3 years      
Warranty Term 2 years      
Subsequent Event [Member] | Loan and Security Agreement [Member] | Wilmington Trust, National Association [Member] | Senior Secured Term Loans [Member]        
Debt Instrument, Face Amount     $ 85,000,000  
Tealstone Construction [Member] | Subsequent Event [Member]        
Business Acquisition, Percentage of Voting Interests Acquired     100.00%