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Note 9 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
2019
  $
64
 
2020
   
66
 
2021
   
68
 
2022
   
46
 
Total   $
244