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Note E - Stock-based Compensation (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
May 29, 2014
Mar. 31, 2020
Jan. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value       $ 80,000 $ 39,000
Share-based Payment Arrangement, Expense       $ 305,000 $ 306,000
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic and Diluted (in dollars per share)       $ 0.04 $ 0.04
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 1,074,000   $ 1,074,000 $ 1,648,000
Amortization, Current Year [Member]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   266,000   266,000  
Amortization Year 2 [Member]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   354,000   354,000  
Amortization, Year 3 [Member]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   354,000   354,000  
Amortization, Year 4 [Member]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   92,000   92,000  
Amortization, Year 5 [Member]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 8,000   $ 8,000  
Restricted Stock [Member]          
Number of Common Stock Accrued Under Share-based Compensation Plan (in shares)       9,608  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)       $ 49.47  
Accrual Shares to Each Non-employee Director [Member]          
Share-based Payment Arrangement, Expense       $ 80,000 $ 90,000
Accrual Shares to Each Non-employee Director [Member] | Non-Employee Directors [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period (in shares)       326 205
The 2014 Stock Option Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 750,000        
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Key Employees [Member]          
Number of Common Stock Accrued Under Share-based Compensation Plan (in shares)     7,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)     $ 56.45    
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Director [Member]          
Number of Common Stock Accrued Under Share-based Compensation Plan (in shares)   2,608      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)   $ 30.75      
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%