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Note 6 - Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
   
December 31,
 
   
2020
   
2019
 
                 
Raw materials
  $
4,855,000
    $
4,284,000
 
Work in process
   
2,890,000
     
2,559,000
 
Finished goods
   
3,403,000
     
4,460,000
 
    $
11,148,000
    $
11,303,000