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Note 8 - Inventories (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
2020
    
December 31,
2019
  
Raw materials
   $
1,177,000
     $
1,545,000
  
Work in Process
    
2,799,000
      
3,110,000
  
Finished Goods
    
7,224,000
      
9,134,000
  
In Transit
    
88,000
      
100,000
  
Allowance for excess quantities
    
(318,000
)
    
(352,000
)
Total inventories
   $
10,970,000
     $
13,537,000