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Note 1 - Organization and Summary of Significant Accounting Policies - Prepaid Expense and Other Current Assets (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Prepaid insurance $ 204,988 $ 173,890
Prepaid expenses - various 72,403 101,221
Prepaid taxes 3,164 2,888
Prepaid Expense and Other Assets, Current $ 280,555 $ 277,999