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Note 4 - Accounts Receivable - Accounts Receivable (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Accounts receivable | $ 2,874,656 | $ 1,442,231
Billed Revenues [Member] | Government Sector [Member] |  |
Accounts receivable | 2,832,906 | 1,425,217
Unbilled Revenues [Member] |  |
Accounts receivable | $ 41,750 | $ 17,014

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