Note 14 - Stock Incentive and Employee Benefit Plans - Unrecognized Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Unrecognized expense	$ 27,810	$ 18,183	$ 14,134
Weighted average period (Year)	2 years	2 years	2 years
Stock Options and Stock Appreciation Rights [Member]
Unrecognized expense	$ 3,255	$ 7,216	$ 6,777
Weighted average period (Year)	1 year 109 days	2 years 36 days	2 years 36 days
Restricted Stock [Member]
Unrecognized expense	$ 11,146	$ 5,850	$ 4,090
Weighted average period (Year)	2 years 73 days	2 years 36 days	2 years 36 days
Performance Shares [Member]
Unrecognized expense	$ 13,409	$ 5,117	$ 3,267
Weighted average period (Year)	2 years	2 years	1 year 255 days