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Note 7 - Commitments (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Lessee, Operating Lease, Disclosure [Table Text Block]
Years ending December 31
:
       
201
8
  $
594
 
201
9
   
612
 
202
0
   
630
 
202
1
   
649
 
Tota
l
  $
2,485