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Note 1 - Organization and Summary of Significant Accounting Policies - Prepaid Expenses and Other Current Assets (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Prepaid insurance | $ 94,841 | $ 204,988
Prepaid expenses - various | 120,534 | 72,403
Prepaid taxes | 814 | 3,164
Prepaid Expense and Other Assets, Current | $ 216,189 | $ 280,555

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