Note 3 - Balance Sheet Components (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]

	June 30, 2023		December 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

Property, Plant and Equipment [Table Text Block]

	June 30, 2023			December 31, 2022
Equipment and furnishings	$	749,617		$	725,812
Leasehold improvements		115,605			115,605
Total property and equipment		865,222			841,417
Accumulated depreciation and amortization		(641,142	)		(606,505	)
Total property and equipment, net	$	224,080		$	234,912

Schedule of Other Assets [Table Text Block]

	June 30, 2023		December 31, 2022
Prepaid clinical trial costs (noncurrent portion)	$	1,106,778	$	2,083,276
Prepaid technology license fees		80,000		80,000
Deposits		11,010		11,010
Total other assets	$	1,197,788	$	2,174,286

Schedule of Accrued Liabilities [Table Text Block]

	June 30, 2023		December 31, 2022
Accrued technology license fees	$	2,000,000	$	2,000,000
Payroll-related liabilities		123,922		550,810
Other accrued expenses		1,090,459		449,402
Total accrued expenses	$	3,214,381	$	3,000,212