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Note 1 - Organization and Summary of Significant Accounting Policies - Accounts Payable (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Research and development expenses	$ 1,337,755	$ 904,572
Legal expenses	93,071	24,496
Other	42,987	84,031
Accounts Payable, Current, Total	$ 1,473,813	$ 1,013,099

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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