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Note 7 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year
 
 
 
 
201
8
  $
698
 
2019
   
722
 
2020
   
776
 
2021
   
800
 
2022
   
190
 
Total
  $
3,186