Note 11 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

	Year Ended December 31,
	2024			2023
United States	$	(4,033	)	$	(4,357	)
Foreign		—			—
Total	$	(4,033	)	$	(4,357	)

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Year Ended December 31,
	2024		2023
Current:
Federal	$	—	$	—
Foreign		3		15
State		7		12
Total current		10		27
Total deferred		—		—
Income tax expense	$	10	$	27

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

	Year Ended December 31,
	2024			2023
U.S. federal income taxes at the statutory rate	$	(847	)	$	(915	)
State taxes, net of federal effects		(57	)		(58	)
U.S. Federal and state NOL carryforward adjustment for expired NOLs		62			613
Stock compensation plan adjustments		67			385
Change in valuation allowance		1,026			(112	)
State taxes, change in apportionment rate		(297	)		43
Other		56			71
Income tax expense	$	10		$	27

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

	Year Ended December 31,
	2024			2023
Deferred tax assets (liabilities):
Tax benefit of operating loss carry forward - Federal	$	30,164		$	29,416
Tax benefit of operating loss carry forward - State		6,319			5,965
Accrued expenses		211			131
Deferred revenue		8			36
Stock-based compensation		—			56
Fixed assets		1			4
Inventory		199			156
Intangible amortization		19			32
Section 174 research and experimentation		261			—
Section 163(j) interest expense		—			314
R&D credit		2,154			2,154
Texas margin tax temporary credit		37			55
Other		33			61
Total deferred tax asset, net of deferred tax liabilities		39,406			38,380
Valuation allowance		(39,406	)		(38,380	)
Net deferred tax asset	$	—		$	—