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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, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Net loss $ (2,036) $ (1,739) $ (2,155) $ (111) $ (3,775) $ (2,266)
Less: Retained earnings reduction due to preferred stock down round feature triggered (1,996)   0   (1,996) 0
Net loss attributable to common stockholders (basic and diluted) $ (4,032)   $ (2,155)   $ (5,771) $ (2,266)
Weighted-average shares of common stock outstanding used in computing net loss per share of common stock (basic and diluted) (in shares) 3,176   1,507   2,609 1,469
Net loss per share attributable to common stockholders (basic and diluted) (in dollars per share) $ (1.27)   $ (1.43)   $ (2.21) $ (1.54)