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Note 2 - Summary of Significant Accounting Policies - Calculation of Basic and Diluted EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Net loss $ (111) $ (1,518)
Weighted-average shares of common stock used in computing net loss per share attributable to common stockholders (basic and diluted) (in shares) 50,088 41,782
Net loss per share attributable to common stockholders (basic and diluted) (in dollars per share) $ 0.00 $ (0.04)