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Note E - Stock Based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Mar. 02, 2006
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value           $ 655,000 $ 186,000  
Allocated Share-based Compensation Expense, Total           $ 395,000 284,000  
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic and Diluted   $ 0.02   $ 0.02   $ 0.05    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total   $ 1,008,000   $ 1,663,000   $ 1,008,000 $ 1,663,000  
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic             $ 0.02  
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Diluted             $ 0.03  
Share Price               $ 46.97
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares, Ending Balance   0       0    
Proceeds from Stock Options Exercised           $ 468,000 $ 112,000  
Amortization, Current Year [Member]                
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total   $ 319,000       319,000    
Amortization Year 2 [Member]                
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total   552,000       552,000    
Amortization, Year 3 [Member]                
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total   $ 137,000       $ 137,000    
Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value [1]           $ 36.35    
Nonqualified Options [Member] | Annual Grant to Non-employee [Member]                
Allocated Share-based Compensation Expense, Total             $ 70,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period         614      
Accrual Shares to Each Non-employee Director [Member]                
Allocated Share-based Compensation Expense, Total           $ 70,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period     276          
The 2006 Stock Option Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 750,000              
The 2014 Stock Option Plan [Member]                
Number of Common Stock Accrued Under Share-based Compensation Plan for Each Non-employee Director           1,932    
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Director [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value           $ 36.35    
The 2014 Stock Option Plan [Member] | Minimum [Member] | Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 85.00%              
The 2014 Stock Option Plan [Member] | Minimum [Member] | Nonqualified Options [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage           20.00%    
The 2014 Stock Option Plan [Member] | Maximum [Member] | Nonqualified Options [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage           25.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period           10 years    
[1] The weighted-average grant date fair value was based on the closing price of the Company's stock on the date of the grant.