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Note 5 - Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Accounts receivable - current | $ 1,411,462 |  | $ 1,411,462 |  | $ 561,834
Loss on foreign currency transactions | (50,000) | $ 0 | (50,000) | $ 0 | 0
Allowance for doubtful account | (13,785) |  | (13,785) |  | (13,785)
Accounts receivable, net of allowances for doubtful accounts | $ 1,347,677 |  | $ 1,347,677 |  | $ 548,049

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