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Note 5 - Accounts Receivable (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
  

September 30,

  

December 31,

 
  

2021

  

2020

 
         

Accounts receivable - current

 $1,605,024  $561,834 

Loss on foreign currency

  (50,000

)

  - 

Allowance for doubtful accounts

  (13,785

)

  (13,785

)

Accounts receivable, net of allowances for doubtful accounts

 $1,541,239  $548,049