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Note 6 - Stock-Based Compensation - Schedule of Restricted Stock Units Deferred Stock Units and Performance Units (Details) - Restricted Stock, Performance-based Stock Units, and Deferred Stock Units [Member] - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Balance (in shares) 160 202
Balance (in dollars per share) $ 5.7 $ 9.7
Granted (in shares) 678 343
Granted (in dollars per share) $ 2.3 $ 5.6
Vested (in shares) (640) (293)
Vested (in dollars per share) $ 2.9 $ 5.77
Forfeited (in shares) (16) (92)
Forfeited (in dollars per share) $ 7.1 $ 13.9
Balance (in shares) 182 160
Balance (in dollars per share) $ 1.89 $ 5.7