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Note 4 - Accounts Receivable (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Schedule of Receivables with Imputed Interest [Table Text Block] |
|  | September 30, |  |  | December 31, |
|  | 2020 |  |  | 2019 |
Trade accounts |  | $ | 3,259,830 |  |  | $ | 3,346,215 |
Premiums |  |  | 521,935 |  |  |  | 971,963 |
Allowance for doubtful accounts |  |  | (195,799 | ) |  |  | (127,635 | )
Total Accounts Receivable, net |  | $ | 3,585,966 |  |  | $ | 4,190,543 |

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