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Note 2 - Risks and Uncertainties (Details Textual) - 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	Dec. 31, 2025	Dec. 31, 2024
Retained Earnings (Accumulated Deficit), Total	$ (192,949)				$ (192,949)		$ (172,768)
Net Income (Loss) Attributable to Parent, Total	(10,139)	$ (10,042)	$ (7,699)	$ (7,707)	(20,181)	$ (15,406)
Net Cash Provided by (Used in) Operating Activities, Total					(17,196)	(14,747)
Cash, Cash Equivalents, and Short-Term Investments, Total	43,500				43,500
Working Capital	37,700				37,700
Stockholders' Equity Attributable to Parent, Ending Balance	38,338	$ 47,235	$ 27,170	$ 33,954	38,338	$ 27,170	$ 56,111	$ 40,718
Approximation [Member]
Stockholders' Equity Attributable to Parent, Ending Balance	$ 38,300				$ 38,300

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