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Note 3 - Contract Receivables (Tables)
3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
 
 
March 31, 2016
 
 
December 31, 2015
 
Billed
  $ 167,889     $ 163,355  
Unbilled
    110,865       95,748  
Allowance for doubtful accounts
    (2,341
)
    (2,138
)
Contract receivables, net
  $ 276,413     $ 256,965