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Note E - Stock-based Compensation (Details Textual) - USD ($)		1 Months Ended			6 Months Ended
	May 29, 2014	Apr. 30, 2020	Mar. 31, 2020	Jan. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value					$ 636,000	$ 685,000
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic and Diluted (in dollars per share)					$ 0.04	$ 0.07
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total					$ 603,000	$ 1,438,000
Amortization, Current Year [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total					109,000
Amortization, Next Year [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total					215,000
Amortization Year 2 [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total					215,000
Amortization, Year 3 [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total					59,000
Amortization, Year 4 [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total					5,000
Salaries, Wages and Benefits [Member]
Share-based Payment Arrangement, Expense					326,000	526,000
Director [Member] | Salaries, Wages and Benefits [Member]
Share-based Payment Arrangement, Expense					$ 90,000	$ 100,000
Restricted Stock [Member]
Number of Common Stock Accrued Under Share-based Compensation Plan (in shares)					9,850
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)					$ 49.28
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)		242	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)		$ 41.40	$ 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%

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Represents the impact of allocated share-based compensation expense on earnings per share, basic and diluted, during the period.

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