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Note 4 - Accounts Receivable - Schedule of Receivables (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Allowance for doubtful accounts | $ (121,022) | $ (328,522)
Accounts receivable, net | 4,468,863 | 4,041,563
Trade Accounts Receivable [Member] |  |
Accounts receivable, gross | 3,688,116 | 3,537,864
Premium [Member] |  |
Accounts receivable, gross | $ 901,769 | $ 832,221

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