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Note 11 - Financial Information about Geographic Areas (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
For the Three Months Ended
    
For the Nine Months Ended
  
   
September 30,
    
September 30,
  
   
2020
    
2019
    
2020
    
2019
  
Net sales by geographic region
                                
United States
   $
24,295,000
     $
11,806,000
     $
62,461,000
     $
35,004,000
  
International
    
5,732,000
      
221,000
      
11,220,000
      
741,000
  
                                 
Consolidated net sales
   $
30,027,000
     $
12,027,000
     $
73,681,000
     $
35,745,000
  
   
September 30,
    
December 31,
  
   
2020
    
2019
  
Long-lived assets by geographic region
                
United States
   $
2,642,000
     $
2,450,000
  
International
    
1,444,000
      
1,493,000
  
                 
Consolidated total long-lived assets
   $
4,086,000
     $
3,943,000