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Note 9 - Stock-based Compensation - Summary of RSU Activity (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Unvested, shares (in shares) 1,500 900
Unvested, weighted average price (in dollars per share) $ 3.83 $ 3.83
Granted, shares (in shares) 2,791 900
Granted, weighted average price (in dollars per share) $ 1.89 $ 3.93
Granted, weighted average fair value $ 5,275 $ 3,537
Vested, shares (in shares) (525) (300)
Vested, weighted average price (in dollars per share) $ 3.87 $ 3.83
Vested, weighted average fair value $ (2,032) $ (1,149)
Forfeited or canceled, shares (in shares) 0 0
Forfeited or canceled, weighted average price (in dollars per share) $ 0 $ 0
Unvested, weighted average fair value $ 9,076 $ 5,745
Unvested, shares (in shares) 3,766 1,500
Unvested, weighted average price (in dollars per share) $ 2.41 $ 3.83