Note 3 - Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Provision at the U.S. federal statutory rate, percent		21.00%
State and income tax, percent		4.90%
Foreign tax effects, including foreign valuation allowance	$ 9
Foreign tax effects, including foreign valuation allowance, percent	(0.40%)	0.20%
Effect of changes in tax laws or rates enacted in the current period	$ 0
Effect of changes in tax laws or rates enacted in the current period, percent	0.00%	0.90%
Effect of cross-border tax laws	$ (17)
Effect of cross-border tax laws, percent	0.70%
R&D tax credits	$ (202)
R&D tax credits, percent	8.80%	(11.20%)
Other tax credits	$ 6
Other tax credits	(0.30%)
Changes in valuation allowances (federal only)	$ 612
Changes in valuation allowances (federal only), percent	(26.40%)	105.60%
Stock compensation	$ (44)
Stock compensation, percent	1.90%
Other nondeductible	$ 26
Other nondeductible, percent	(1.20%)
Changes in unrecognized tax benefits	$ 0
Changes in unrecognized tax benefits, percent	0.00%
Other adjustments: deferred revenue	$ 73
Other adjustments: deferred revenue, percent	(3.10%)
Other adjustments	$ 22
Other adjustments, percent	(1.00%)	(2.30%)
Income tax expense	$ 15	$ 77
Income tax expense, percent	(0.70%)	(4.10%)
Accrual to return		2.10%
Research and development credit	(8.80%)	11.20%
Share based compensation		(9.00%)
Net Operating Loss expiration		(144.30%)
Other Deferred true up		6.40%
Illinois Department of Revenue [Member]
State and income tax	$ 12
State and income tax, percent	(0.60%)
Departments of Revenue, Excluding Illinois [Member]
State and income tax	$ 3
State and income tax, percent	(0.10%)
Chilean Tax Authority [Member[
Chile outside basis differential		(0.80%)
Domestic Tax Jurisdiction [Member]
Provision at the U.S. federal statutory rate	$ (485)
Provision at the U.S. federal statutory rate, percent	21.00%