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Note 2 - Contract Receivables (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
March 31,
2017
    
December 31,
2016
  
Billed
   $
167,561
     $
170,436
  
Unbilled
    
114,385
      
113,520
  
Allowance for doubtful accounts
    
(3,151
)
    
(2,591
)
Contract receivables, net
   $
278,795
     $
281,365