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Note 3 - Contract Receivables (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
201
6
    
201
5
  
Billed
   $
168,012
     $
159,985
  
Unbilled
    
108,432
      
90,262
  
Retainages
    
5,088
      
5,486
  
Other
    
2,424
      
3,370
  
Allowance for doubtful accounts
    
(2,591
)
    
(2,138
)
Contract receivables, net
   $
281,365
     $
256,965