Note 8 - Share-based Compensation - Restricted Stock Activity (Details) - $ / shares		3 Months Ended
	Feb. 24, 2022	Mar. 31, 2022
Restricted Stock [Member]
Outstanding (in shares)		1,212,783
Outstanding, weighted average exercise price (in dollars per share)		$ 37.48
Granted (in shares)		301,011
Granted (in dollars per share)		$ 26.38
Vested (in shares)		(165,366)
Vested (in dollars per share)		$ 37.48
Forfeited (in shares)		(14,642)
Forfeited (in dollars per share)		$ 44.37
Non-vested as of March 31, 2022 (in shares)		1,333,786
Non-vested as of March 31, 2022 (in dollars per share)		$ 34.90
Market-based Restricted Stock [Member]
Granted (in dollars per share)		$ 22.66
Vested (in shares)	(218,280)	(218,280)
Vested (in dollars per share)		$ 10.95
Outstanding (in shares)		139,756
Outstanding at beginning of year, grant date fair value (in dollars per share)		$ 19.86
Granted (in shares)		349,568
Non-vested as of March 31, 2022 (in shares)		271,044
Non-vested as of March 31, 2022 (in dollars per share)		$ 30.64