Note 3 - Balance Sheet Components - Prepaid Expenses (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Prepaid clinical trial costs (current portion)	$ 1,941,588	$ 1,171,077
Prepaid insurance premiums	36,150	107,876
Prepaid rent	13,045	13,045
Other prepaid expenses	47,500	34,000
Total prepaid expenses	$ 2,038,283	$ 1,325,998