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Note 8 - Commitments (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Operating Leases of Lessee Disclosure [Table Text Block]
Years ending December 31:
       
2017
  $
576
 
2018
   
594
 
2019
   
612
 
2020
   
631
 
2021 and thereafter
   
649
 
Total
  $
3,062