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Note E - Stock-based Compensation (Details Textual) - USD ($)		3 Months Ended
	May 29, 2014	Mar. 31, 2021	Mar. 31, 2020
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Diluted (in dollars per share)		$ 0.02	$ 0.04
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 1,977,000	$ 1,074,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value			80,000
Amortization, Current Year [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		253,000
Amortization, Next Year [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		370,000
Amortization Year 2 [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		305,000
Amortization, Year 3 [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		296,000
Amortization, Year 4 [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		354,000
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		160,000	305,000
Salaries, Wages and Benefits [Member] | Director [Member]
Share-based Payment Arrangement, Expense		$ 80,000	$ 80,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)		(0)
Accrual Shares to Each Non-employee Director [Member] | Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period (in shares)		163
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]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)		0
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

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

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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