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Note 7 - 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, 2020
Dec. 31, 2019
Balance (in shares) 287 777
Balance (in dollars per share) $ 14.44 $ 14.08
Granted (in shares) 313 31
Granted (in dollars per share) $ 5.89 $ 12.12
Vested (in shares) (174) (107)
Vested (in dollars per share) $ 7.77 $ 11.79
Forfeited (in shares) (139) (414)
Forfeited (in dollars per share) $ 15.24 $ 14.28
Balance (in shares) 287 287
Balance (in dollars per share) $ 8.78 $ 14.44