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Note 11 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
2019
  $
1,710
 
2020
   
1,612
 
2021
   
868
 
2022
   
296
 
2023
   
286
 
Thereafter
   
1,421
 
Total
  $
6.193