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Note 6 - Other Income (Tables)
12 Months Ended
Dec. 31, 2015
Other Income and Expenses [Abstract]  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
      2015       2014       2013  
                         
Earnings from equity method investments   $ (729 )   $ (589 )   $ (1,107 )
Other     (393 )     (673 )     (444 )
    $ (1,122 )   $ (1,262 )   $ (1,551 )