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Note 5 - Accounts Receivable (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
  

September 30,

  

December 31,

 
  

2022

  

2021

 
         

Accounts receivable - current

 $2,131,821  $1,234,411 

Loss on foreign currency

  (50,000

)

  (50,000

)

Allowance for doubtful account

  (273,785

)

  (213,785

)

Accounts receivable, net of allowances for doubtful accounts

 $1,808,036  $970,626