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Note 6 - Commitments and Contingent Liabilities (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
    Payments Due By
Period
  2016     $ 3,929  
  2017       3,768  
  2018       3,693  
  2019       3,738  
  2020       2,764  
  Thereafter       14,655  
        $ 32,547