Note 21 - Incentive Plans - Restricted Stock Activity (Details) - Restricted Stock [Member] - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restricted stock outstanding as of January 1, (in shares)	1,712,534	1,911,145	1,591,082
Granted (in shares)	756,530	729,160	804,465
Vested (in shares)	(520,539)	(875,202)	(418,309)
Forfeited (in shares)	(17,793)	(52,569)	(66,093)
Restricted stock outstanding as of December 31, (in shares)	1,930,732	1,712,534	1,911,145