Annual report pursuant to Section 13 and 15(d)

Note 10 - Share-based Awards and Cash-based Awards - Summary of Share Activity Related to Restricted Stock Units (Details)

v3.20.4
Note 10 - Share-based Awards and Cash-based Awards - Summary of Share Activity Related to Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Nonvested, units (in shares) 1,614,722 3,355,917 5,765,251
Nonvested, weighted average grant date fair value per unit (in dollars per share) $ 5.73 $ 3.90 $ 2.48
Granted, units (in shares) 0 994,698 988,955
Granted, weighted average grant date fair value per unit (in dollars per share) $ 0 $ 4.51 $ 6.90
Vested, units (in shares) (787,203) (1,475,373) (2,261,665)
Vested, weighted average grant date fair value per unit (in dollars per share) $ 6.90 $ 2.76 $ 2.21
Forfeited, units (in shares) (63,831) (1,260,520) (1,136,624)
Forfeited, weighted average grant date fair value per unit (in dollars per share) $ 5.80 $ 3.37 $ 2.68
Nonvested, units (in shares) 763,688 1,614,722 3,355,917
Nonvested, weighted average grant date fair value per unit (in dollars per share) $ 4.51 $ 5.73 $ 3.90