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Note 8 - Net Income Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net income (loss) $ (6,467) $ (3,261) $ (5,118) $ (2,568) $ (1,838) $ (2,526) $ (6,844) $ (14) $ (17,414) $ (11,221) $ 668,629
Weighted-average number of common shares—basic (in shares)                 30,043,380 30,823,458 38,945,468
Net income (loss) per share—basic (in dollars per share)                 $ (0.58) $ (0.36) $ 17.17
Weighted-average number of common shares—diluted (in shares)                 30,043,380 30,823,458 46,319,457
Net income (loss) per share—diluted (in dollars per share)                 $ (0.58) $ (0.36) $ 14.44