Note 3 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2025

Notes Tables

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

Origin of loss before taxes	2025			2024
United States	$	(2,268	)	$	(1,740	)
Foreign		(41	)		(126	)
Loss before income taxes	$	(2,309	)	$	(1,866	)

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

	2025			2024
Current:
Federal	$	—		$	—
State		(4	)		(51	)
Foreign		—			(22	)
Total current		(4	)		(73	)
Deferred:
Federal		—			(2	)
State		(11	)		(2	)
Total deferred		(11	)		(4	)
Income tax expense	$	(15	)	$	(77	)

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

	Amount			Percentage
Provision at the U.S. federal statutory rate		(485	)		21.0	%
State and local income taxes, net of federal income tax effect
IL state and local income tax		12			(0.6	)%
All other state and local income tax		3			(0.1	)%
Foreign tax effects, including foreign valuation allowance		9			(0.4	)%
Effect of changes in tax laws or rates enacted in the current period		—			—	%
Effect of cross-border tax laws		(17	)		0.7	%
Tax credits
R&D tax credits		(202	)		8.8	%
Other tax credits		6			(0.3	)%
Changes in valuation allowances (federal only)		612			(26.4	)%
Nontaxable or nondeductible items
Stock compensation		(44	)		1.9	%
Other		26			(1.2	)%
Changes in unrecognized tax benefits		—			—	%
Other adjustments: deferred revenue		73			(3.1	)%
Other adjustments		22			(1.0	)%
Income tax expense		15			(0.7	)%

	2024
Provision at the U.S. federal statutory rate		21.0	%
State taxes, net of federal benefit		4.9	%
Foreign tax rate differential		0.2	%
Valuation allowance		105.6	%
Chile outside basis differential		(0.8	)%
Accrual to return		2.1	%
Research and development credit		11.2	%
State rate change		0.9	%
Share based compensation		(9.0	)%
Net Operating Loss expiration		(144.3	)%
Other Deferred true up		6.4	%
Other		(2.3	)%
Income tax expense effective rate		(4.1	)%

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

	2025			2024
Deferred tax assets:
Stock compensation expense	$	36		$	80
Royalty accruals		9			10
Bad debt allowance		52			51
Net operating loss carryforwards		10,192			9,067
Credit carry-forwards		1,668			1,472
Inventory reserve		157			154
Depreciation		402			433
Research and Development Costs		1,920			2,233
Other		569			399
Total deferred tax assets		15,005			13,899
Deferred tax liabilities:
Goodwill		(353	)		(296	)
Intangible assets		(78	)		(82	)
Total deferred tax liabilities		(431	)		(378	)
Net deferred tax asset before valuation allowance		14,574			13,521
Valuation allowances for deferred tax assets		(14,761	)		(13,697	)
Net deferred tax liability	$	(187	)	$	(176	)

Summary of Valuation Allowance [Table Text Block]

Year	Balance at January 1		Charged to costs and expenses			(Deductions)/Other		Balance at December 31
2024	$	15,699		(2,002	)		—	$	13,697
2025	$	13,697		1,064			—	$	14,761

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

Year	Balance at January 1		Change in positions taken in a current period		Balance at December 31
202	$	326		144	$	470
2025	$	470		85	$	555

Schedule of Cash Taxes Paid [Table Text Block]

	2025
Federal	$	—
State		11
Foreign		—
Total	$	11

	2025
California	$	1
Louisiana		(1	)
New Jersey		2
Pennsylvania		7
Other		2
Total	$	11