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Note 6 - Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30,
   
December 31,
 
   
2020
   
2019
 
                 
Raw materials
  $
7,963,000
    $
4,284,000
 
Work in process
   
1,905,000
     
2,559,000
 
Finished goods
   
3,287,000
     
4,460,000
 
    $
13,155,000
    $
11,303,000