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Note 5 - Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Accounts receivable $ 1,446,033 $ 561,834
Allowance for doubtful accounts (13,785) (13,785)
Accounts receivable, net of allowances for doubtful accounts $ 1,432,248 $ 548,049