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Note 2 - Sales of Subsidiary; Discontinued Operations (Tables)
 3 Months Ended
Mar. 31, 2016
Income Statement Disclosures [Member]  
Notes Tables  
Disposal Groups, Including Discontinued Operations [Table Text Block]
 
 
Three Months Ended March 31
,
 
(unaudited, in thousands)
 
201
6
 
 
2015
 
Net sales
   $ --     $ 2,902  
Operating loss
     --       (3 )
Net income (loss) before income taxes
     --       6  
Income taxes
     --       9  
Net loss from discontinued operations
   $ --     $ (3 )