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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