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Note 3 - Contract Receivables (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
 
 
June 30, 2016
 
 
December 31, 2015
 
Billed
  $ 173,271     $ 163,355  
Unbilled
    112,004       95,748  
Allowance for doubtful accounts
    (2,602
)
    (2,138
)
Contract receivables, net
  $ 282,673     $ 256,965