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Note 13 - Segment Information - Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Total share-based compensation $ 1,118   $ 771   $ 1,940 $ 1,638
Operating loss (10,498)   (8,007)   (20,980) (16,151)
Other income, net 366   314   813 757
Income tax expense (7)   (6)   (14) (12)
Net loss (10,139) $ (10,042) (7,699) $ (7,707) (20,181) (15,406)
Single Reportable Segment [Member]            
Total operating expenses, excluding share-based compensation 9,380   7,236   19,040 14,513
Total share-based compensation 1,118   771   1,940 1,638
Operating loss (10,498)   (8,007)   (20,980) (16,151)
Interest income 385   313   855 757
Other income, net (19)   1   (42) 0
Income tax expense (7)   (6)   (14) (12)
Net loss $ (10,139)   $ (7,699)   $ (20,181) $ (15,406)