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Note 1 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Allowance for doubtful accounts $ 971,772 $ 660,581
Bad debt expense 353,562
Receivables written off during the periods (3,494)
Effect of currency translation (5,773) (42,371)
Allowance for doubtful accounts $ 962,505 $ 971,772