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Note 1 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Allowance for doubtful accounts $ 498,044 $ 612,434
Bad debt expense (28,499) 320,270
Receivables written off during the periods (24,415) (484,265)
Effect of currency translation (36,054) 49,605
Allowance for doubtful accounts $ 409,076 $ 498,044