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Note E - Stock-based Compensation (Details Textual) - USD ($)		3 Months Ended
	May 29, 2014	Mar. 31, 2022	Mar. 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)		0
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		$ 2,840,000	$ 1,977,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value			$ 160,000
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic (in dollars per share)			$ 0.02
Amortization, Current Year [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		510,000
Amortization, Next Year [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		625,000
Amortization Year 2 [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		617,000
Amortization, Year 3 [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		646,000
Amortization, Year 4 [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		331,000
Amortization, Year 5 [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		$ 137,000
Director [Member] | Salaries, Wages and Benefits [Member]
Share-Based Payment Arrangement, Expense			$ 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)		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, Equity Instruments Other than Options, Vested in Period (in shares)		(0)
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] | 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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+ References

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
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+ References

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