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Note 9 - Share-based Compensation (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2015
Proceeds from Stock Options Exercised $ 0 $ 0 $ 0  
Share-based Payment Arrangement, Exercise of Option, Tax Benefit 1,900,000 3,800,000 1,100,000  
Share-based Payment Arrangement, Option [Member] | Selling, General and Administrative Expenses [Member]        
Share-based Payment Arrangement, Expense $ 934,000 $ 1,100,000 $ 1,200,000  
Common Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 100,615 116,276 299,917  
Common Class B Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     49,986  
Nonvested [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 411,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 3 years 10 days      
Nonvested [Member] | Selling, General and Administrative Expenses [Member]        
Share-based Payment Arrangement, Expense $ 290,000 $ 428,000 $ 629,000  
Restricted Stock [Member]        
Tax Benefit Realized Restricted Stock Vested $ 0 168,000 $ 1,300,000  
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] | Share-based Payment Arrangement, 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] | Share-based Payment Arrangement, 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]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 851,956      
Share-based Compensation Arrangement by Share-based Payment Award, Options Grants Cumulative 2,148,044      
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 $ 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]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 736,492      
Share-based Compensation Arrangement by Share-based Payment Award, Options Grants Cumulative 1,063,508      
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  
Share-based Compensation Arrangement by Share-based Payment Award, Nonvested Restricted Stock, Outstanding Number 84,176      
Common Class B [Member]        
Share-based Payment Arrangement, Accelerated 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 Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 100,615      
Common Stock [Member] | Share-based Payment Arrangement, Option [Member]        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 1,500,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 328 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      
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      
Common Stock [Member] | The 2006 Equity Incentive Plan [Member] | Nonvested [Member]        
Stock Issued During Period, Shares, Restricted Stock Award, Gross 6,005 6,793