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Note 19 - Equity Incentive Plans (Details)
1 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Dec. 31, 2012
Note 19 - Equity Incentive Plans (Details) [Line Items]            
Maximum Period of Common Stock Granted     10 years      
Annual Increments to Be Vested in Common Stock Units 20.00%   20.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     0 0 0  
Proceeds from Stock Options Exercised (in Dollars) | $     $ 5,014,000 $ 128,000 $ 14,755,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     214,580 5,500 594,946  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars) | $     $ 2,000,000 $ 16,000    
Equity Incentive Plan [Member]            
Note 19 - Equity Incentive Plans (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 7,000,000   7,000,000      
2005 Incentive Plan [Member]            
Note 19 - Equity Incentive Plans (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 3,562,168   3,562,168      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 3,181,112   3,181,112      
Restricted Stock Units (RSUs) [Member]            
Note 19 - Equity Incentive Plans (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     72,900 17,601 25,037  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) | $ / shares     $ 28.11 $ 24.66 $ 20.68  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years 2 years 2 years 2 years
Number of Officers Receiving Award 7 6     8  
Allocated Share-based Compensation Expense (in Dollars) | $     $ 4,500,000 $ 3,800,000 $ 2,000,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars) | $ $ 7,500,000   $ 7,500,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 146 days      
Performance TSR Restricted Stock [Member]            
Note 19 - Equity Incentive Plans (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 61,209 60,456     119,840  
Performance EPS Restricted Stock Units [Member]            
Note 19 - Equity Incentive Plans (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 57,409 57,642     116,186