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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 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Net loss $ (2,155) $ (111) $ (1,859) $ (1,518) $ (2,266) $ (3,377)
Weighted-average shares of common stock used in computing net loss per share (basic and diluted) (in shares) 52,735   42,561   51,419 42,174
Net loss per share (basic and diluted) (in dollars per share) $ (0.04)   $ (0.04)   $ (0.04) $ (0.08)