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Note 6 - Other Income (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
    2016   2015   2014
             
Disposal (gain) loss, net   $
(1,084
 )   $
(11
 )   $
100
  
Unusual gain    
(439
 )    
(382
 )    
(773
 )
Equity earnings    
(894
 )    
(729
 )    
(589
 )
    $
(2,417
 )   $
(1,122
 )   $
(1,262
 )