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Note 4 - Accounts Receivable - Schedule of Receivables (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Allowance for doubtful accounts | $ (328,522) | $ (127,635)
Accounts receivable, net | 4,041,563 | 4,190,543
Trade Accounts Receivable [Member] |  |
Accounts receivable, gross | 3,537,864 | 3,346,215
Premium [Member] |  |
Accounts receivable, gross | $ 832,221 | $ 971,963

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