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Note E - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Mar. 02, 2006
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 28, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance             45,068
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           $ 557,000 $ 446,000    
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic and Diluted   $ 0.02   $ 0.02   $ 0.07 $ 0.05    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total   $ 846,000   $ 1,501,000   $ 846,000 $ 1,501,000    
Share Price               $ 65.09  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares, Ending Balance   0       0      
Proceeds from Stock Options Exercised           $ 486,000 122,000    
Amortization, Current Year [Member]                  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total   $ 157,000       157,000      
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] | Nonqualified Options [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance   0       0      
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%                
[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.