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Note 13 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year ended December 31,
 
 
 
 
         
2019
  $
1,946
 
2020
   
1,581
 
2021
   
1,272
 
2022- and thereafter
   
8,433
 
         
    $
13,232