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Note 11 - Financial Information about Geographic Areas (Tables)
3 Months Ended
Mar. 31, 2023
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,

 
   

2023

   

2022

 

Net sales by geographic region

               

United States

  $ 13,694,000     $ 17,076,000  

International

    106,000       585,000  
                 

Consolidated net sales

  $ 13,800,000     $ 17,661,000  
   

March 31,

   

December 31,

 
   

2023

   

2022

 

Long-lived assets by geographic region

               

United States

  $ 4,460,000     $ 4,380,000  

International

    1,328,000       1,362,000  
                 

Consolidated total long-lived assets

  $ 5,788,000     $ 5,742,000