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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, 2022
Dec. 31, 2021
Balance (in shares) 202 287
Balance (in dollars per share) $ 9.70 $ 8.78
Granted (in shares) 343 163
Granted (in dollars per share) $ 5.60 $ 7.21
Vested (in shares) (293) (242)
Vested (in dollars per share) $ 5.77 $ 6.82
Forfeited (in shares) (92) (6)
Forfeited (in dollars per share) $ 13.90 $ 14.99
Balance (in shares) 160 202
Balance (in dollars per share) $ 5.70 $ 9.70