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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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