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Note 1 - Organization and Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts receivable | $ 291,435 | $ 294,199
Billed Revenues [Member] |  |
Accounts receivable | 240,267 | 130,532
Unbilled Revenues [Member] |  |
Accounts receivable | $ 51,168 | $ 163,667

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