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Note 13 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year ended December 31,
 
 
 
 
         
2018
  $
2,961
 
2019
   
1,524
 
2020
   
1,298
 
2021- and thereafter
   
9,185
 
         
    $
14,968