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Note 2 - Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
    Years Ended December 31,
    2016   2015   2014
Interest   $
66
     $
86
     $
103
  
Income taxes, net of refunds   $
3,562
     $
1,459
     $
3,259