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Note 4 - Contract Receivables (Tables)
9 Months Ended
Sep. 30, 2015
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
 
 
September 30, 2015
 
 
December 31, 2014
 
Billed
  $ 154,251     $ 165,934  
Unbilled
    119,770       96,207  
Allowance for doubtful accounts
    (2,350 )     (1,887 )
Contract receivables, net
  $ 271,671     $ 260,254