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Note 4 - Contract Receivables (Tables)
6 Months Ended
Jun. 30, 2015
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
 
 
June 30, 2015
 
 
December 31, 2014
 
Billed
  $ 178,413     $ 165,934  
Unbilled
    107,340       96,207  
Allowance for doubtful accounts
    (2,547
)
    (1,887 )
Contract receivables, net
  $ 283,206     $ 260,254