Note 20 - Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Share-based Compensation, Stock Options, Activity [Table Text Block]

	Shares			Weighted-Average Exercise Price Per Share		Aggregate Intrinsic V alue (in millions)
Options outstanding, January 1, 2016		9,012,441		$	31.09	$	27.4
Exercised		(1,167,819	)	$	18.03	$	12.4
Forfeited		(1,830,893	)	$	39.69
Options outstanding, December 31, 2016		6,013,729		$	32.09	$	12.1
Exercised		(83,863	)	$	18.20	$	3.4
Forfeited		(2,464,920	)	$	35.91
Options outstanding, December 31, 2017		3,464,946		$	27.81	$	-
Exercised		(42,259	)	$	14.00	$	0.1
Forfeited		(1,781,321	)	$	36.53
Options outstanding, December 31, 2018		1,641,366		$	18.78	$	0.4
Options exercisable (fully vested) -
December 31, 2016		5,144,416		$	32.56	$	11.3
December 31, 2017		3,464,946		$	27.81	$	4.0
December 31, 2018		1,641,366		$	18.78	$	0.4

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	201 8			201 7			201 6
Restricted stock outstanding as of January 1,		1,777,429			1,930,732			1,712,534
Granted (1)		1,100,590			646,142			756,530
Vested		(751,201	)		(783,872	)		(520,539	)
Forfeited		(21,904	)		(15,573	)		(17,793	)
Restricted stock outstanding as of December 31,		2,104,914			1,777,429			1,930,732

Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block]

	201 8			201 7			201 6
Performance share awards outstanding as of January 1,		235,950			197,249			202,754
Granted (1)		297,450			135,780			100,170
Vested (2)		(100,170	)		(97,079	)		(105,675	)
Performance share awards outstanding as of December 31,		433,230			235,950			197,249

Performance Shares [Member]

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	201 8			201 7			201 6
Stock price	$	14.99		$	24.91		$	26.29
Dividend yield (1)		0	%		0	%		0	%
Risk-free rate		2.39	%		1.45	%		0.87	%
Volatility (2)		22.90	%		18.93	%		18.80	%
Term of the award (years)		2.85			2.88			2.88