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Note 4 - Accounts Receivable (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Schedule of Receivables with Imputed Interest [Table Text Block] |
|  | September 30, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
Trade accounts |  | $ | 3,842,133 |  |  | $ | 3,537,864 |
Premiums |  |  | 785,252 |  |  |  | 832,221 |
Allowance for doubtful accounts |  |  | (149,194 | ) |  |  | (328,522 | )
Total Accounts Receivable, net |  | $ | 4,478,191 |  |  | $ | 4,041,563 |

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