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Note 2 - Contract Receivables (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
June 30,
2017
    
December 31,
2016
  
Billed
   $
165,753
     $
170,436
  
Unbilled
    
125,629
      
113,520
  
Allowance for doubtful accounts
    
(3,204
)
    
(2,591
)
Contract receivables, net
   $
288,178
     $
281,365