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Note 8 - Stock Based Compensation - Summary of Non-vested Stock Options (Details) - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Non-vested, shares (in shares) 0 2
Non-vested, Weighted average exercise price per share (in dollars per share) $ 0 $ 5.50
Non-vested, Weighted average grant date fair value (in dollars per share) $ 0 $ 3.05
Vested, shares (in shares) 0 (2)
Vested, Weighted average exercise price per share (in dollars per share) $ 0 $ 5.50
Vested, Weighted average grant date fair value (in dollars per share) $ 0 $ 3.05
Non-vested, shares (in shares) 0 0
Non-vested, Weighted average exercise price per share (in dollars per share) $ 0 $ 0
Non-vested, Weighted average grant date fair value (in dollars per share) $ 0 $ 0