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Note E - Stock-based Compensation (Details Textual) - USD ($) |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 29, 2014 | Jun. 30, 2022 | May 31, 2022 | Feb. 28, 2022 | Jun. 30, 2022 | Jun. 30, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value |  |  |  |  | $ 93,000 | $ 80,000
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Diluted (in dollars per share) |  |  |  |  | $ 0.01 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | $ 2,776,000 |  |  | $ 2,776,000 | $ 2,035,000
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic (in dollars per share) |  |  |  |  |  | $ 0.03
Amortization, Current Year [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | 362,000 |  |  | 362,000 |
Amortization, Next Year [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | 649,000 |  |  | 649,000 |
Amortization Year 2 [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | 641,000 |  |  | 641,000 |
Amortization, Year 3 [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | 670,000 |  |  | 670,000 |
Amortization, Year 4 [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | 343,000 |  |  | 343,000 |
Amortization, Year 5 [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | $ 111,000 |  |  | 111,000 |
Salaries, Wages and Benefits [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  | 353,000 | $ 253,000
Director [Member] | Salaries, Wages and Benefits [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  | $ 55,000 | $ 80,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period (in shares) |  |  |  |  |  | 326
Restricted Stock [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  | 34,475 |
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) |  |  |  |  | $ 37.18 |
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] | Stock Award [Member] | Key Employees [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 29,120 |  |
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) |  |  |  | $ 38.80 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  | 4 years |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Key Employees [Member] | Share-Based Payment Arrangement, 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] | Key Employees [Member] | Share-Based Payment Arrangement, 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] | Key Employees [Member] | Share-Based Payment Arrangement, 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] | Key Employees [Member] | Share-based Payment Arrangement, 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] | Director [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 1,855 |  |  |
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) |  |  | $ 29.60 |  |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | A Key Employee [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 3,500 |  |  |  |
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) |  | $ 27.68 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  | 4 years |  |  |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | A Key Employee [Member] | Share-Based Payment Arrangement, 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] | A Key Employee [Member] | Share-Based Payment Arrangement, 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] | A Key Employee [Member] | Share-Based Payment Arrangement, 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] | A Key Employee [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] | Minimum [Member] | Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent | 85.00% |  |  |  |  |

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