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Note 4 - Financing Arrangements (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
201
8
   
201
9
   
20
20
   
202
1
   
202
2
   
Thereafter
   
Total
 
$ 825     $
489
    $
188
    $
33
    $
13
    $
9
    $
1,557