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Note D - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Mar. 02, 2006
Sep. 30, 2016
Sep. 30, 2015
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
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] | Stock Award [Member] | Employee-Director [Member] | Share-based Compensation Award, Tranche Two [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         25.00%  
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Employee-Director [Member] | Share-based Compensation Award, Tranche Three [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         25.00%  
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Employee-Director [Member] | Share-based Compensation Award, Tranche Four [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         25.00%  
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Employee-Director [Member] | Share-based Compensation Award, Tranche One [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         25.00%  
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Employee-Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         5,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 30.81  
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         2,275  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 30.80  
The 2014 Stock Option Plan [Member] | Restricted Stock [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 85.00%          
The 2014 Stock Option Plan [Member] | Nonqualified Options [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         20.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period         5 years  
The 2014 Stock Option Plan [Member] | Nonqualified Options [Member] | Maximum [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  
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         7,275  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value [1]         $ 30.81  
Nonqualified Options [Member] | Annual Grant to Non-employee [Member]            
Allocated Share-based Compensation Expense         $ 70,000 $ 70,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period       175 325  
Basic [Member]            
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic and Diluted   $ 0.01     $ 0.03  
Diluted [Member]            
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic and Diluted         $ 0.02  
Amortization, Current Year [Member]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 51,000     $ 51,000  
Amortization Year 2 [Member]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   135,000     135,000  
Amortization, Year 3 [Member]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   98,000     98,000  
Amortization, Year 4 [Member]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   6,000     6,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value         202,000 158,000
Allocated Share-based Compensation Expense   56,000 $ 49,000   251,000 $ 218,000
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic and Diluted           $ 0.02
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 290,000     $ 290,000  
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Diluted     $ 0.01      
Share Price   $ 20.02     $ 20.02  
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options         $ 74,000 $ 236,000
[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.