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Note 11 - Share-based Compensation (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Proceeds from Stock Options Exercised $ 0 $ 0 $ 548,000  
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options 3,800,000 1,100,000 398,000  
Employee Stock Option [Member] | Selling, General and Administrative Expenses [Member]        
Allocated Share-based Compensation Expense, Total $ 1,100,000 $ 1,200,000 $ 964,000  
Common Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 116,276 299,917 315,620  
Common Class B Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   49,986 52,603  
Nonvested [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 471,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 204 days      
Nonvested [Member] | Selling, General and Administrative Expenses [Member]        
Allocated Share-based Compensation Expense, Total $ 428,000 $ 629,000 $ 966,000  
Restricted Stock [Member]        
Tax Benefit Realized Restricted Stock Vested $ 168,000 $ 1,300,000 $ 161,000  
The 2001 Equity Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       0
The 2001 Equity Incentive Plan [Member] | 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      
The 2001 Equity Incentive Plan [Member] | Employee Stock Option [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years      
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year    
Share Based Compensation Arrangement By Share Based Payment Award, Award Annual Options Grant Amount $ 100,000      
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Minimum [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   3 years    
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Maximum [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years    
The 2006 Equity Incentive Plan [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 5 years      
The 2006 Equity Incentive Plan [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years      
The 2006 Equity Incentive Plan [Member] | Nonvested [Member]        
Stock Issued During Period, Shares, Restricted Stock Award, Gross   0    
Common Class B [Member]        
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost $ 331,000      
Common Class B [Member] | The 2001 Equity Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 300,000      
Common Class B [Member] | Director Plan 2004 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 500,000      
Common Class B [Member] | Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options Granted at Annual Meeting   6,000    
Common Class B [Member] | The 2006 Equity Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 300,000      
Common Class B [Member] | The 2006 Equity Incentive Plan [Member] | Nonvested [Member]        
Stock Issued During Period, Shares, Restricted Stock Award, Gross     3,430  
Common Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 116,276      
Common Stock [Member] | Employee Stock Option [Member]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 1,200,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 317 days      
Common Stock [Member] | The 2001 Equity Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,800,000      
Common Stock [Member] | Director Plan 2004 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 3,000,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 879,240      
Share-based Compensation Arrangement by Share-based Payment Award, Options Grants Cumulative 2,120,760      
Common Stock [Member] | Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options Granted at Annual Meeting   36,000    
Common Stock [Member] | The 2006 Equity Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,800,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 815,828      
Share-based Compensation Arrangement by Share-based Payment Award, Options Grants Cumulative 984,172      
Common Stock [Member] | The 2006 Equity Incentive Plan [Member] | Nonvested [Member]        
Stock Issued During Period, Shares, Restricted Stock Award, Gross 6,793   20,578  
Share-based Compensation Arrangement by Share-based Payment Award, Nonvested Restricted Stock, Outstanding Number 78,171