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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 9 Months Ended
Sep. 09, 2022
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Net Loss   $ (1,757) $ (2,036) $ (1,739) $ (136) [1] $ (2,155) $ (111) $ (5,532) $ (2,402) [1]
Less: Increase to accumulated deficit due to adjustment to Series C Preferred Stock conversion price   0     0     (194) 0
Net loss attributable to common stockholders (basic and diluted)   $ (1,757)     $ (5,793) [1]     $ (7,528) $ (8,059) [1]
Weighted-average shares of common stock outstanding used in computing net loss per share of common stock (basic and diluted)* (in shares)   4,692     1,604 [1]     3,311 1,514 [1]
Net loss per share attributable to common stockholders (basic and diluted)* (in dollars per share)   $ (0.37)     $ (3.61) [1]     $ (2.27) $ (5.32) [1]
Series B Preferred Stock [Member]                  
Less: Increase to accumulated deficit due to adjustment to Series C Preferred Stock conversion price $ (5,700) $ 0     $ (5,657) [1]     $ (1,802) $ (5,657) [1]
Series C Preferred Stock [Member]                  
Less: Increase to accumulated deficit due to adjustment to Series C Preferred Stock conversion price   $ 0     $ 0 [1]     $ (194) $ 0 [1]
[1] After giving retroactive effect to a 1-for-35 reverse stock split that became effective November 15, 2022.