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Note 1 - Summary of Business and Significant Accounting Policies (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Aug. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Ownership Interest in Joint Venture   50.00%    
Estimated Construction Gross Profit (Loss) Per Diluted Share   $ 0.27 $ 0.50 $ 0.50
Proceeds from Sale of Long-term Contract $ 7,100      
Contract Receivable     $ 0  
Notes Payable, Noncurrent   $ 2,700    
Contract Receivable Retainage   23,400 19,800  
Unbilled Contracts Receivable   0 0  
Interest Income from Contracts Receivable     200 $ 400
Allowance for Doubtful Accounts Receivable, Write-offs   0 0 0
Inventory, Net   3,708 2,535  
Depreciation   15,700 16,200 18,200
Capitalized Debt Fees     1,300  
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums   800 1,100  
Amortization of Debt Issuance Costs   300 300 200
Impairment of Long-Lived Assets Held-for-use   $ 0 0 0
Number of Operating Segments   1    
Number of Reportable Segments   1    
Number of Reporting Units   1    
Long-term Contract Receivable [Member]        
Fair Value Inputs, Discount Rate   4.25%    
Costs and Estimated Earnings in Excess of Billings [Member]        
Unapproved Change Orders, Amount   $ 2,200 1,600  
Contracts Receivable, Claims and Uncertain Amounts   9,200 5,200  
Contracts Receivable, Unpaid Project Contract Price   3,900 3,900  
Other Noncurrent Liabilities [Member] | JBC Former Owners [Member] | Fair Value, Inputs, Level 3 [Member]        
Business Combination, Contingent Consideration, Liability     0  
Current Maturities of Long-term Debt [Member]        
Capital Lease Obligations   400    
Long-term Debt, Net of Current Maturities [Member]        
Capital Lease Obligations     500  
Operating Income (Loss) [Member]        
Estimated Construction Gross (Loss) Profit, Before Tax   (6,300) $ (9,700) $ 9,100
Other Operating Income (Expense) [Member]        
Gain (Loss) on Sale of Long-term Contract $ 1,400      
Earn-out Expense   $ 1,200    
Minimum [Member]        
Revenue Recognition Percentage of Completion Range   12 years    
Warranty Term   1 year    
Minimum [Member] | Notes Payable for Transportation and Construction Equipment [Member]        
Debt Instrument, Term   3 years    
Debt Instrument, Interest Rate, Stated Percentage   3.12%    
Maximum [Member]        
Revenue Recognition Percentage of Completion Range   36 years    
Warranty Term   2 years    
Maximum [Member] | Notes Payable for Transportation and Construction Equipment [Member]        
Debt Instrument, Term   5 years    
Debt Instrument, Interest Rate, Stated Percentage   6.92%