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Note 3 - Commitments and Contingent Liabilities (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
    (unaudited)
     
2017   $
1,629
 
2018    
5,801
 
2019    
5,643
 
2020    
3,310
 
2021    
3,508
 
Thereafter    
13,074
 
    $
32,965