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Note 4 - Accounts Receivable (Tables)
9 Months Ended
Sep. 30, 2025
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
  

September 30,

  

December 31,

 
  

2025

  

2024

 
         

Accounts receivable

 $1,342,757  $1,351,482 

Allowance for credit losses

  (383,254)  (633,253)

Accounts receivable, net of allowances for credit losses

 $959,503  $718,229