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Note E - Stock-based Compensation (Details Textual) - USD ($)
1 Months Ended 6 Months Ended
May 29, 2014
May 31, 2024
Jun. 30, 2024
Jun. 30, 2023
Feb. 15, 2024
Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value     $ 550,000 $ 400,000    
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Diluted (in dollars per share)     $ 0.01 $ 0.01    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount     $ 1,779,000 $ 2,482,000    
Amortization, Current Year [Member]            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount     373,000      
Amortization, Next Year [Member]            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount     777,000      
Amortization Year 2 [Member]            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount     494,000      
Amortization, Year 3 [Member]            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount     136,000      
Salaries, Wages and Benefits [Member]            
Share-Based Payment Arrangement, Expense     393,000 242,000    
Director [Member] | Salaries, Wages and Benefits [Member]            
Share-Based Payment Arrangement, Expense     $ 38,000 $ 55,000    
Unrestricted Shares [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     2,130      
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)     $ 17.6      
Unrestricted Shares [Member] | Share-Based Payment Arrangement, Nonemployee [Member] | Director [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   2,130        
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)   $ 17.6        
The 2014 Stock Option Plan [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)           3,000,000
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 2024 Plan [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)         1,600,000