v3.25.4
Note 15 - Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Effective Income Tax Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Income taxes computed at U.S. statutory rates, amount $ 6,778 $ 8,183
Income taxes computed at U.S. statutory rates, percent 21.00% 21.00%
State income taxes, net of federal tax benefit, amount $ (7) $ (10)
State income taxes, net of federal tax benefit, percent 0.00% 0.00%
Change in valuation allowance, amount $ (4,860) $ (7,001)
Change in valuation allowance, percent (15.00%) (18.00%)
Other, amount $ 263 $ (91)
Other, percent 1.00% 0.00%
Research and development tax credits, amount $ 832 $ 1,373
Research and development tax credits, percent 3.00% 4.00%
Stock compensation expense windfall (shortfall), amount $ (542) $ 171
Stock compensation expense windfall (shortfall), percent (2.00%) 1.00%
Other, amount $ (270) $ (56)
Other, percent (1.00%) 0.00%
Change in unrecognized tax benefits, amount $ (96) $ (74)
Change in unrecognized tax benefits, percent 0.00% 0.00%
Total $ (31) $ (44)
Total, percent 0.00% 0.00%
Foreign Tax Jurisdiction [Member] | His Majesty's Revenue and Customs (HMRC) [Member]    
Change in valuation allowance, amount $ (2,513) $ (2,443)
Change in valuation allowance, percent (8.00%) (6.00%)
Statutory rate differential, amount $ 407 $ 615
Statutory rate differential, percent 1.00% 2.00%
Research and development tax deductions and credits, amount $ 25 $ 650
Research and development tax deductions and credits, percent 0.00% 2.00%
NOLs surrendered for refundable tax credit $ 0 $ (1,355)
NOLs surrendered for refundable tax credit, percent 0.00% (3.00%)
Other, amount $ (54) $ 3
Other, percent 0.00% 0.00%
Foreign Tax Jurisdiction, Other [Member]    
Other, amount $ 6 $ (9)
Other, percent 0.00% 0.00%