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Note 4 - Accounts Receivable - Allowance for Doubtful Accounts (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Allowance for doubtful accounts $ 637,556 $ 134,912
Bad debt expense (24,627) 578,423
Receivables written off during the period (482,470) (49,577)
Effect of exchange rate changes 78,707 (26,202)
Allowance for doubtful accounts $ 209,166 $ 637,556