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Note 14 - Stock Incentive and Employee Benefit Plans (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount $ 7,000    
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 10,200,000 $ 4,700,000 $ 3,600,000
Independent Directors [Member]      
Stock Issued During Period, Shares, Share-based Compensation, Gross 22,710 13,498 12,174
Employee Stock Option [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 5 years    
Employee Stock Option [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 329,198 133,616 94,590
Stock Appreciation Rights (SARs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0 2,200,000 1,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options Value Per Share Cap $ 20    
Stock Appreciation Rights (SARs) [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 5 years    
Stock Appreciation Rights (SARs) [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years    
Stock Options and Stock Appreciation Rights [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options and Equity Instruments Other than Options, Vested and Expected to Vest, Number 3,853,751    
Share-based Compensation Arrangement by Share-based Payment Award, Options and Equity Instruments Other than Options, Vested and Expected to Vest, Weighted Average Exercise Price $ 34.19    
Share-based Compensation Arrangement by Share-based Payment Award, Options and Equity Instruments Other than Options, Vested and Expected to Vest, Weighted Average Remaining Contractual Term 1 year 339 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options and Equity Instruments Other than Options, Vested and Expected to Vest, Fair Value $ 3,200,000 $ 5,000,000 $ 2,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 5,700,000 $ 37,500,000 $ 12,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 18,100,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 14,600,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 18,100,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 5.30 $ 4.95