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Note 6 - Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
   
December 31,
 
   
2019
   
2018
 
                 
Raw materials
  $
4,784,000
    $
4,732,000
 
Work in process
   
1,144,000
     
825,000
 
Finished goods
   
4,479,000
     
4,321,000
 
    $
10,407,000
    $
9,878,000