Income Taxes - (Details - Components of Net Deferred Tax Assets) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Net operating loss carryforwards	$ 11,808,000	$ 10,150,000
Tax credit carryforwards	1,227,000	946,000
Stock-based compensation	435,000	1,363,000
Capitalized research and development expenses	1,662,000	0
License fees	1,680,000	2,018,000
Lease liability	46,000	79,000
Other timing differences	120,000	169,000
Deferred tax assets	16,978,000	14,725,000
Deferred tax liabilities:
Right of use asset	(43,000)	(76,000)
Deferred tax liability	(43,000)	(76,000)
Valuation allowance	(16,935,000)	(14,649,000)
Net deferred tax asset	$ 0	$ 0