Note 14 - Stock Incentive and Employee Benefit Plans - Stock Options and Stock Appreciation Rights by Exercise Price Range (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Range 1 [Member]
Exercise price, low (in dollars per share)	$ 17.88
Exercise price, high (in dollars per share)	$ 21.45
Number of shares (in shares) | shares	1,284,466
Weighted average exercise price (in dollars per share)	$ 19.99
Weighted average remaining contractual life (Year)	354 days
Exercisable shares (in shares) | shares	1,010,466
Weighted average exercise price, exercisable (in dollars per share)	$ 19.99
Range 2 [Member]
Exercise price, low (in dollars per share)	28.35
Exercise price, high (in dollars per share)	$ 41.16
Number of shares (in shares) | shares	1,032,006
Weighted average exercise price (in dollars per share)	$ 38.86
Weighted average remaining contractual life (Year)	3 years 58 days
Exercisable shares (in shares) | shares	539,446
Weighted average exercise price, exercisable (in dollars per share)	$ 38.86
Range 3 [Member]
Exercise price, low (in dollars per share)	41.95
Exercise price, high (in dollars per share)	$ 46.45
Number of shares (in shares) | shares	1,690,695
Weighted average exercise price (in dollars per share)	$ 42.79
Weighted average remaining contractual life (Year)	2 years 14 days
Exercisable shares (in shares) | shares	1,239,472
Weighted average exercise price, exercisable (in dollars per share)	$ 42.79