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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
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Net loss $ (10,608) $ (5,824)
Less: Preferred deemed dividend 0 735
Less: Retained earnings reduction related to preferred stock down round feature triggered 5,657 0
Net loss attributable to common stockholders $ (16,265) $ (6,559)
Weighted-average shares of common stock outstanding used in computing net loss per share of common stock (basic and diluted) (in shares) 1,610 1,247
Net loss per share attributable to common stockholders (basic and diluted) (in dollars per share) $ (10.10) $ (5.26)