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Note 6 - Segment Information - Schedule of Revenue by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues $ 430 $ 838 $ 1,542 $ 2,453
Cost of revenues 9 23 24 64
Research and development 794 822 2,843 2,692
General and administrative 862 734 2,747 2,696
Other income, net 124 171 405 455
Income (loss) before provision for income taxes 13,934 (1,054) 10,140 (4,388)
Provision for income taxes 0 (11) (10) 10
Income (loss) from continuing operations 13,934 (1,043) 10,150 (4,398)
Operating Segments [Member]        
Revenues 430 838 1,542 2,453
Cost of revenues [1] 10 23 24 64
Research and development [1] 47 78 132 146
General and administrative [1] 302 152 848 875
Payroll and related [1] 1,257 1,508 4,877 4,898
Professional fees and IP [1] 414 236 1,073 969
Marketing and travel [1] 97 57 351 374
Total costs and expenses [1] 2,127 2,054 7,305 7,326
Other segment items(b) [2] 15,507 11 15,498 31
Other income, net 124 151 405 454
Income (loss) before provision for income taxes 13,934 (1,054) 10,140 (4,388)
Provision for income taxes 0 (11) (10) 10
Income (loss) from continuing operations $ 13,934 $ (1,043) $ 10,150 $ (4,398)
[1] The significant expense categories and amounts align with the segment-level information that is regularly provided to the chief operating decision-maker.
[2] Other segment items primarily include depreciation and amortization, payroll and related - re-allocated to cost of revenues, and stock options expense.