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Note E - Stock Based Compensation (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2019
May 29, 2014
Apr. 24, 2019
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value       $ 39,000 $ 39,000
Allocated Share-based Compensation Expense, Total       $ 306,000 $ 233,000
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic and Diluted       $ 0.04 $ 0.03
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 1,648,000     $ 1,648,000 $ 1,171,000
Proceeds from Stock Options Exercised       0 168,000
Amortization, Current Year [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total 630,000     630,000  
Amortization Year 2 [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total 430,000     430,000  
Amortization, Year 3 [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total 294,000     294,000  
Amortization, Year 4 [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 294,000     294,000  
Accrual Shares to Each Non-employee Director [Member]          
Allocated Share-based Compensation Expense, Total       $ 90,000  
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         276
The 2014 Stock Option Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   750,000      
Number of Common Stock Accrued Under Share-based Compensation Plan for Each Non-employee Director 205        
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Director [Member] | Subsequent Event [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 48.94    
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%