Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Net Loss Per Share - Summary of Significant Accounting Policies - Net Loss Per Common Share (Details)

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Note 11 - Net Loss Per Share - Summary of Significant Accounting Policies - Net Loss Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Net loss $ (3,059) $ (3,358) $ (3,508) $ (3,450) $ (3,274) $ (3,622) $ (9,925) $ (10,346)
Weighted average shares outstanding—basic and diluted (in shares) 26,443,067     19,035,713     26,443,067 18,863,829
Basic and diluted net loss per share (in dollars per share) $ (0.12)     $ (0.18)     $ (0.38) $ (0.55)