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Note 8 - Share-based Payment Awards (Details Textual) - USD ($)
 3 Months Ended
Dec. 31, 2018
Mar. 31, 2026
Mar. 31, 2025
Jan. 01, 2026
Dec. 31, 2025
Dec. 31, 2024
Common Stock, Capital Shares Reserved for Future Issuance, Increase (in shares)       1,081,882   1,068,323
Common Stock, Shares, Outstanding (in shares)   27,359,791     27,047,061 26,709,084
Share-Based Payment Arrangement, Expense   $ 1,518,000 $ 1,200,000      
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount   $ 9,166,000        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)   272,597 108,451      
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)   $ 5.13 $ 3.63      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value   $ 3,473,000 $ 1,167,000      
Share-Based Payment Arrangement, Option [Member]            
Share-Based Payment Arrangement, Expense   $ 888,000 929,000      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   3 years        
Restricted Stock Units (RSUs) [Member]            
Share-Based Payment Arrangement, Expense   $ 521,000 190,000      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   3 years        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 6,054        
General and Administrative Expenses [Member]            
Share-Based Payment Arrangement, Expense   1,469,000 1,161,000      
Research and Development Expenses [Member]            
Share-Based Payment Arrangement, Expense   $ 49,000 39,000      
The 2018 Plan [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)   1,301,548        
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase in Share Reserve as a Percent of Outstanding Common Stock   4.00%        
The 2018 Employee Stock Purchase Plan [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)   975,687        
Common Stock, Capital Shares Reserved for Future Issuance, Increase (in shares) 150,000          
Share-Based Payment Arrangement, Expense   $ 109,000 $ 81,000      
Common Stock, Capital Shares Reserved for Future Issuance (in shares) 150,000          
Common Stock, Capital Shares Reserved for Future Issuance, Percentage Increase 1.00%          
Employee Stock Purchase Plans, Fair Value of Common Stock Price Per Share on Offering Date, Percentage 85.00%          
Employee Stock Purchase Plans, Fair Value of Common Stock Price Per Share on Purchase Date, Percentage 85.00%          
Employee-related Liabilities, Current   $ 258,000     $ 45,000