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Note 9 - Inventories, Net of Continuing Operations (Tables)
 3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
2021
    
December 31,
2020
  
Raw materials
   $
1,218,000
     $
1,177,000
  
Work in process
    
2,979,000
      
2,799,000
  
Finished goods
    
6,890,000
      
7,224,000
  
In Transit
    
86,000
      
88,000
  
Allowance for excess quantities
    
(250,000
)
    
(318,000
)
Total inventories
   $
10,923,000
     $
10,970,000