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Note 4 - Computation of Net Loss Per Common Share - Reconciliation of Numerators and Denominators of EPS Calculation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Net loss $ (2,524) $ (5,398) $ (2,524) $ (5,398)
Weighted-average shares of common stock outstanding (in shares) 36,991 29,706    
Weighted-average shares subject to repurchase (in shares) (1,315) (1,448)    
Shares used in per-share calculation - basic (in shares) 35,676 28,258    
Shares used in per-share calculation - diluted (in shares) 35,676 28,258    
Net loss per share - basic (in dollars per share) $ (0.07) $ (0.19)    
Net loss per share - diluted (in dollars per share) $ (0.07) $ (0.19)