Note 14 - Stock Incentive and Employee Benefit Plans (Details) - Stock Options And Stock Appreciation Rights By Exercise Prices Range	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, low	$ 3.35
Exercise price, high	$ 21.45
Number of shares (in Shares) | shares	1,680,292
Weighted average exercise price	$ 19.52
Weighted average remaining contractual life	1 year 251 days
Exercisable shares (in Shares) | shares	1,406,292
Weighted average exercise price, exercisable	$ 19.52
Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, low	28.35
Exercise price, high	$ 41.16
Number of shares (in Shares) | shares	1,212,111
Weighted average exercise price	$ 38.83
Weighted average remaining contractual life	3 years 361 days
Exercisable shares (in Shares) | shares	280,230
Weighted average exercise price, exercisable	$ 38.83
Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, low	41.95
Exercise price, high	$ 46.45
Number of shares (in Shares) | shares	2,008,214
Weighted average exercise price	$ 42.77
Weighted average remaining contractual life	2 years 324 days
Exercisable shares (in Shares) | shares	867,592
Weighted average exercise price, exercisable	$ 42.77