Note 23 - Incentive Plans - Performance Shares Activity (Details) - Performance Shares [Member] - shares		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restricted stock outstanding as of January 1, (in shares)		1,052,100	913,800	704,530
Granted (1) (in shares)	[1]	458,660	545,380	506,720
Vested (in shares)	[2]	(506,720)	(407,080)	(297,450)
Restricted stock outstanding as of December 31, (in shares)		1,004,040	1,052,100	913,800

[1] The weighted-average grant date fair value for performance shares issued during the years ended December 31, 2022, 2021 and 2020 were $31.19, $22.96 and $18.02, respectively.

[2] For the years ended December 31, 2022, 2021 and 2020, the corresponding common stock equivalent of these vested awards were 998,238, 814,160 and 594,900 shares, respectively.