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Note 8 - Geographic Segment Data (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
  

Net Sales to Outside Customers

 
  

For the Three Months Ended

 
  

June 30,

 
  

2021

  

2020

 
         

United States

 $5,711,952  $4,542,484 

Mexico

  613,289   1,202,869 
         
  $6,325,241  $5,745,353 
  

Net Sales to Outside Customers

 
  

For the Six Months Ended

 
  

June 30,

 
  

2021

  

2020

 
         

United States

 $12,310,942  $9,968,423 

Mexico

  1,430,467   2,844,431 
         
  $13,741,409  $12,812,854 
Long-lived Assets by Geographic Areas [Table Text Block]
  

Total Assets at

 
  

June 30,

  

December 31,

 
  

2021

  

2020

 
         

United States

 $15,801,575  $12,458,706 

Mexico

  8,681,668   8,798,046 

Assets Held for Sale International Subsidiaries

  -   294,219 
         
  $24,483,243  $21,550,971