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Note 3 - Commitments and Contingent Liabilities (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
    (unaudited)
     
2017   $
2,736
 
2018    
4,872
 
2019    
4,839
 
2020    
3,486
 
2021    
3,495
 
Thereafter    
13,062
 
         
    $
32,490