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Note 4 - Accounts Receivable - Allowance for Doubtful Accounts (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Allowance for doubtful accounts at the beginning of the period $ 134,912 $ 59,559
Bad debt expense 81,940 82,066
Receivables written off during the periods 0 (10,298)
Effect of currency translation (5,100) 3,585
Allowance for doubtful accounts at the end of the period $ 211,752 $ 134,912