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Note 6 - 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
 
Amount
 
2019
  $
1,946
 
2020
   
1,428
 
2021
   
945
 
2022
   
682
 
2023
   
340
 
Total
  $
5,341