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Note 5 - Operating Leases (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
201
7
 
 
201
8
 
 
201
9
 
 
20
20
 
 
202
1
 
$ 660     $
558
    $
416
    $
100
    $
-