Note 20 - Incentive Plans - Restricted Stock Activity (Details) - Restricted Stock [Member] - shares		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted stock outstanding as of January 1, (in shares)		2,104,914	1,777,429	1,930,732
Granted (1) (in shares)	[1]	884,170	1,100,590	646,142
Vested (in shares)		(603,148)	(751,201)	(783,872)
Forfeited (in shares)		(18,093)	(21,904)	(15,573)
Restricted stock outstanding as of December 31, (in shares)		2,367,843	2,104,914	1,777,429

[1] The weighted-average grant date fair value for restricted stock issued during the years ended December 31, 2019, 2018 and 2017 were $18.03, $14.72 and $25.04, respectively.