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Note 10 - Financial Information about Geographic Areas (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
  

For the Three Months Ended

 
  

March 31,

 
  

2022

  

2021

 

Net sales by geographic region

        

United States

 $17,076,000  $20,898,000 

International

  585,000   2,263,000 
         

Consolidated net sales

 $17,661,000  $23,161,000 
  

March 31,

  

December 31,

 
  

2022

  

2021

 

Long-lived assets by geographic region

        

United States

 $4,668,000  $4,623,000 

International

  1,418,000   1,441,000 
         

Consolidated total long-lived assets

 $5,985,000  $6,064,000