Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Stock-based Compensation (Details Textual)

v3.23.1
Note 11 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Feb. 06, 2023
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Jun. 01, 2021
Common Stock, No Par Value   $ 0   $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   1,700,000      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   10 years      
Employee Stock Purchase Plan, Maximum Payroll Deduction, Percent   15.00%      
Employee Stock Purchase Plan, Stock Purchase Price, Percent   85.00%      
Common shares issued under the ESPP plan (Shares)   21,576 0 10,858  
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount   $ 2,830      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   1 year 7 months 13 days      
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount   $ 5      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number   11,002,000 10,736,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in dollars per share)   $ 4.17 $ 4.68    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term   5 years 6 months 14 days 5 years 6 months    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term   6 years 10 months 2 days 6 years 10 months 24 days    
Share-based Payment Arrangement, Expense   $ 1,874 $ 2,514    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   3,220,000 3,870,000    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price   $ 0.56 $ 1.34    
Weighted average grant date fair value, exercise price   $ 0.66      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   570,000 0    
Common shares issued upon redemption of restricted share units, shares 570,000        
New Incentive Plan [Member]          
Common Stock, No Par Value         $ 0
New Incentive Plan [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)         9,343,242