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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, 2021
Dec. 31, 2020
Balance (in shares) 287 287
Balance (in dollars per share) $ 8.78 $ 14.44
Granted (in shares) 163 313
Granted (in dollars per share) $ 7.21 $ 5.89
Vested (in shares) (242) (174)
Vested (in dollars per share) $ 6.82 $ 7.77
Forfeited (in shares) (6) (139)
Forfeited (in dollars per share) $ 14.99 $ 15.24
Balance (in shares) 202 287
Balance (in dollars per share) $ 9.70 $ 8.78