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Note 1 - Organization and Summary of Significant Accounting Policies - Prepaid Expenses and Other Current Assets (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Prepaid insurance | $ 326,712 | $ 204,988
Prepaid expenses - various | 45,839 | 72,403
Prepaid taxes | $ 3,279 | $ 3,164

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