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Note D - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Mar. 02, 2006
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value           $ 186,000 $ 186,000
Allocated Share-based Compensation Expense       $ 47,000   $ 284,000 $ 196,000
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic   $ 0.02       $ 0.03  
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic and Diluted       $ 0     $ 0.02
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Diluted   $ 0.02       $ 0.02  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 1,663,000   $ 346,000   $ 1,663,000 $ 346,000
Share Price   $ 18.95       $ 18.95  
Proceeds from Stock Options Exercised           $ 112,000 $ 74,000
Amortization, Current Year [Member]              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 330,000       330,000  
Amortization Year 2 [Member]              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   644,000       644,000  
Amortization, Year 3 [Member]              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   552,000       552,000  
Amortization, Year 4 [Member]              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 137,000       $ 137,000  
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           104,298  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value [1]           $ 16.38  
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     614   325    
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] | Director [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           4,298  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value           $ 16.29  
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Chief Executive Officer [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           100,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value   $ 16.38       $ 16.38  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period           3 years  
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Chief Executive Officer [Member] | Share-based Compensation Award, Tranche One [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage           33.00%  
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Chief Executive Officer [Member] | Share-based Compensation Award, Tranche Two [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage           33.00%  
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Chief Executive Officer [Member] | Share-based Compensation Award, Tranche Three [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage           33.00%  
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, Expiration Period           5 years  
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, Expiration Period           10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage           33.00%  
[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.