Note 14 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

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

	Year Ended December 31,
	2023			2022
Statutory federal income tax benefit	$	(3,973,000	)	$	(2,481,000	)
Intangible assets		–			–
PPP loan forgiveness		–			–
Incentive stock options		–			–
Change in valuation allowance		3,779,000			(284,000	)
Expiration of net operating losses		1,469,000			1,356,000
Disallowed financing costs		2,210,000			1,179,000
State and local taxes		(3,508,000	)		200,000
Foreign rate differential		–			11,000
Other		23,000			19,000
Total income tax expense	$	–		$	–

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

	Year Ended December 31,
	2023			2022
Deferred tax assets:
Net operating loss carryforwards	$	29,233,000		$	26,465,000
Income tax credit carryforwards		2,676,000			2,738,000
Stock compensation		620,000			421,000
Lease obligation		1,015,000			908,000
Deferred revenue		75,000			251,000
Inventory Reserve		1,003,000			517,000
Sec. 174 Capitalized R&D		488,000			317,000
Other		267,000			159,000
Total deferred tax assets		35,377,000			31,776,000
Deferred tax liabilities
Depreciation and amortization		–			(252,000	)
Lease asset		(898,000	)		(824,000	)
Total deferred tax liabilities		(898,000	)		(1,076,000	)
Valuation allowance		(34,479,000	)		(30,700,000	)
Net deferred taxes	$	–		$	–