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Note E - Stock-based Compensation (Details Textual) - USD ($)		6 Months Ended
	May 29, 2014	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value		$ 80,000	$ 636,000
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Diluted (in dollars per share)		$ 0.03	$ 0.04
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 2,035,000	$ 603,000
Amortization, Current Year [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		188,000
Amortization, Next Year [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		408,000
Amortization Year 2 [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		343,000
Amortization, Year 3 [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		334,000
Amortization, Year 4 [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		363,000
Amortization, Year 5 [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		288,000
Amortization, Year 6 [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		111,000
Salaries, Wages and Benefits [Member]
Share-based Payment Arrangement, Expense		253,000	326,000
Director [Member] | Salaries, Wages and Benefits [Member]
Share-based Payment Arrangement, Expense		$ 80,000	$ 90,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period (in shares)		163
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		3,804
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)		$ 60.81
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]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		2,500
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)		$ 60.34
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)		1,304
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)		$ 61.70
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%

X

- Definition

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