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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
2019
   
2018
 
                 
Raw materials
  $
4,284,000
    $
4,732,000
 
Work in process
   
2,559,000
     
825,000
 
Finished goods
   
4,460,000
     
4,321,000
 
Total inventory
  $
11,303,000
    $
9,878,000