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Note 4 - Accounts Receivable - Accounts Receivable (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
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Accounts receivable | $ 2,097,521 | $ 1,442,231
Billed Revenues [Member] |  |
Accounts receivable | 2,011,683 | 1,425,217
Billed Revenues [Member] | Government Sector [Member] |  |
Accounts receivable | 1,947,648 | 1,425,217
Billed Revenues [Member] | Commercial and Industrial Sector [Member] |  |
Accounts receivable | 64,035 | 0
Unbilled Revenues [Member] |  |
Accounts receivable | $ 85,838 | $ 17,014

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