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Note G - Stock-based Compensation - Phantom Stock Unit (Details) - Phantom Share Units (PSUs) [Member] - $ / shares	12 Months Ended		24 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020
Balance, number of shares (in shares)	14,820	32,811	32,811
Unvested shares outstanding, weighted average grant date fair value (in dollars per share)	$ 13.55	$ 14.39	$ 14.39
Granted, number of shares (in shares)
Granted, weighted average grant date fair value (in dollars per share)
Settled, number of shares (in shares)	(8,032)	(11,449)
Settled, weighted average grant date fair value (in dollars per share)	$ 16.40	$ 16.01
Forfeited, number of shares (in shares)	(1,656)	(6,542)
Forfeited, weighted average grant date fair value (in dollars per share)	$ 9.70	$ 13.49
Adjustment and Correction (in shares)	(786)
Adjustment and Correction, weighted average grant date fair value (in dollars per share)
Balance, number of shares (in shares)	4,346	14,820	4,346
Unvested shares outstanding, weighted average grant date fair value (in dollars per share)	$ 9.70	$ 13.55	$ 9.70

X

- Definition

The weighted average fair value at grant date for nonvested equity-based awards adjustment and correction on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

No definition available.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that adjustment and correction during the reporting period.

+ References

No definition available.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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-Publisher FASB
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-Paragraph 2
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The weighted average fair value at grant date for nonvested equity-based awards issued 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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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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X

- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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-Topic 718
-SubTopic 10
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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

Net number of non-option equity instruments granted to participants.

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