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Note 7 - Commitments (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Lessee, Operating Lease, Disclosure [Table Text Block]
Years ending December 31:
 
 
 
 
2019
  $
612
 
2020
   
630
 
2021
   
649
 
Total
  $
1,891