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Note 3 - Commitments and Contingent Liabilities (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
    (unaudited)
     
2017   $
3,828
 
2018    
4,706
 
2019    
4,764
 
2020    
3,462
 
2021    
3,472
 
Thereafter    
13,041
 
         
    $
33,273