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Note 6 - Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
   
December 31,
 
   
2018
   
2017
 
                 
Raw materials
  $
4,620,000
    $
4,567,000
 
Work in process
   
1,239,000
     
1,058,000
 
Finished goods
   
4,776,000
     
4,624,000
 
    $
10,635,000
    $
10,249,000