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Note 1 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Allowance for doubtful accounts $ 612,434 $ 971,772
Bad debt expense 327 25,044
Receivables written off during the periods (327) (362,244)
Effect of currency translation (12,571) (22,138)
Allowance for doubtful accounts $ 599,863 $ 612,434