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Note 1 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Allowance for doubtful accounts $ 59,559 $ 409,076
Bad debt expense 82,066 (24,534)
Receivables written off during the periods (10,298) (295,778)
Effect of currency translation 3,585 (29,205)
Allowance for doubtful accounts $ 134,912 $ 59,559