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Note 11 - Stock-Based Compensation (Details) (USD $)
1 Months Ended 12 Months Ended
May 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Note 11 - Stock-Based Compensation (Details) [Line Items]        
Allocated Share-based Compensation Expense   $ 3,400,000 $ 3,300,000 $ 2,700,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense   1,300,000 1,300,000 1,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)   0 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in Shares)   9,832    
Vested Upon Change in Control [Member] | Phantom Share Units (PSUs) [Member]
       
Note 11 - Stock-Based Compensation (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   100.00%    
Restricted Stock Units (RSUs) [Member]
       
Note 11 - Stock-Based Compensation (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in Shares)   246,045 230,675 214,095
Full Value Awards [Member]
       
Note 11 - Stock-Based Compensation (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in Shares) 625,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)   374,658    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   3,500,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   2,900,000 3,300,000 1,800,000
Non-Full Value Awards [Member]
       
Note 11 - Stock-Based Compensation (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)   56,920    
Share-Based Compensation Arrangement by Share-based Payment Award, Number of Shares Moved From Non Full Value Pool to Full Value Pool (in Shares)   3    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   1,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   36 days    
Employee Stock Option [Member]
       
Note 11 - Stock-Based Compensation (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Contractual Term   10 years    
Phantom Share Units (PSUs) [Member]
       
Note 11 - Stock-Based Compensation (Details) [Line Items]        
Allocated Share-based Compensation Expense   343,000 155,000 (34,000)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period   1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   20.00%    
Share Based Compensation, Distributions, Fair Value   $ 9,000 $ 12,000 $ 3,000
Minimum [Member]
       
Note 11 - Stock-Based Compensation (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years