Note 13 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Summary of Operating Loss Carryforwards [Table Text Block]

Year Ending December 31,	Amount
2024	$	66,000
2028		7,000
2030		160,000
2031		73,000
2032		48,000
2034		727,000
2035		1,969,000
2036		2,867,000
2037		2,481,000
Indefinite		41,409,000
Total	$	49,807,000

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	2023			2022
Deferred tax assets:
Net operating loss carryforwards	$	12,624,000		$	10,761,000
Tax credits, net		6,950,000			10,354,000
Impairment allowances		3,000			19,000
Stock-based compensation		68,000			45,000
Other		167,000			105,000
Accrued bonuses		242,000			245,000
Accrued legal		95,000			-
Lease liabilities		262,000			-
Research and development expenses, net		4,646,000			1,642,000
Less valuation allowance		(24,827,000	)		(23,167,000	)
Deferred tax asset, net of valuation		230,000			4,000
Deferred tax liabilities:
Property and equipment		(3,000	)		(4,000	)
Right-of-use assets		(227,000	)		-
Deferred tax liabilities		(230,000	)		(4,000	)
Net tax assets	$	-		$	-

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	2023			2022
Tax benefit (expense) at federal statutory rate		21	%		21	%
Effect of state taxes		4	%		3	%
Other		1	%		-	%
Tax credits, net of reserve		(17	)%		15	%
Nondeductible expenses		(1	)%		(3	)%
Valuation allowance – deferred tax assets		(8	)%		(36	)%
Total tax benefit (provision)	$	-		$	-

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

	2023		2022
Balance, January 1	$	-	$	-
Additions based on tax positions related to the current year		6,950,000		-
Balance, December 31	$	6,950,000	$	-