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Note 4 - Accounts Receivable - Schedule of Receivables (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Allowance for doubtful accounts | $ (108,864) | $ (121,022)
Accounts receivable, net | 5,153,577 | 4,468,863
Trade Accounts Receivable [Member] |  |
Accounts receivable, gross | 4,482,671 | 3,688,116
Premium [Member] |  |
Accounts receivable, gross | $ 779,770 | $ 901,769

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