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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
2015
   
2014
 
Finished goods
  $ 48,206,000     $ 44,610,000  
Work in process
    860,000       323,000  
Raw materials
    14,507,000       13,349,000  
    $ 63,573,000     $ 58,282,000