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Note 8 - Share-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Stock options outstanding, options (in shares) 485,203  
Balance, weighted average exercise price, beginning of period (in dollars per share) $ 17.19  
Stock options outstanding, weighted average remaining contractual term (Year) 8 years 3 months 18 days 8 years 4 months 24 days
Stock options outstanding, aggregate intrinsic value $ 0 $ 0
Stock options granted, options (in shares) 30,000  
Stock options granted, weighted average exercise price (in dollars per share) $ 1.29  
Stock options forfeited, options (in shares) (10,193)  
Stock options forfeited, weighted average exercise price (in dollars per share) $ 9.94  
Outstanding, March 31, 2026 (in shares) 505,010 485,203
Outstanding, March 31, 2026 (in dollars per share) $ 16.39 $ 17.19
Stock options exercisable, options (in shares) 157,036  
Stock options exercisable, weighted average exercise price, ending of period (in dollars per share) $ 48.34  
Stock options exercisable weighted average remaining contractual term (Year) 5 years 3 months 18 days  
Stock options exercisable, aggregate intrinsic value $ 0