Note 5 - Stock-based Compensation - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Jun. 30, 2022 |
Jun. 30, 2021 |
Jun. 30, 2022 |
Jun. 30, 2021 |
|
General and administrative expense | $ 262 | $ 740 | $ 576 | $ 985 |
General and Administrative Expense [Member] | ||||
General and administrative expense | $ 262 | $ 740 | $ 576 | $ 985 |