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Note 12 - 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
  $
746
 
2020
   
671
 
2021
   
477
 
2022
   
284
 
2023
   
106
 
Thereafter
   
36
 
Total
  $
2,320