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Note 6 - Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
   
December 31,
 
   
2021
   
2020
 
                 
Raw materials
  $
10,866,000
    $
9,729,000
 
Work in process
   
2,180,000
     
2,003,000
 
Finished goods
   
5,732,000
     
5,017,000
 
    $
18,778,000
    $
16,749,000