v3.26.1
Note 10 - Equity Incentive Plans (Details Textual) - USD ($)
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) 26,639,812   25,407,299
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) $ 1.52   $ 1.96
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted-Average Remaining Contractual Term (Year) 7 years 5 months 8 days    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value $ 655,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares) 13,756,016    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in dollars per share) $ 2.3    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term (Year) 6 years 5 months 12 days    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 212,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) 111,891 3,625  
Proceeds from Stock Options Exercised $ 57,000 $ 3,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value $ 28,000    
Share Price (in dollars per share) $ 0.61 $ 0.45  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) $ 0.59 $ 0.47  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 11,000,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 2 years 10 months 24 days