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Note E - Stock Based Compensation - Summary of Nonvested Options and Restricted Stock (Details)	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Granted, shares (in shares)
Employee Stock Option [Member]
Nonvested, stock options (in shares)
Nonvested - weighted average grant date fair value, stock options (in dollars per share) | $ / shares
Granted, shares (in shares)
Granted - weighted average grant date fair value, stock options (in dollars per share) | $ / shares
Canceled/forfeited/expired, stock options (in shares)
Canceled/forfeited/expired - weighted average grant date fair value, stock options (in dollars per share) | $ / shares
Vested, stock options (in shares)
Vested - weighted average grant date fair value, stock options (in dollars per share) | $ / shares
Nonvested, stock options (in shares)
Nonvested - weighted average grant date fair value, stock options (in dollars per share) | $ / shares
Restricted Stock [Member]
Nonvested, restricted stock (in shares)	104,150
Nonvested - weighted average grant date fair value, restricted stock (in dollars per share) | $ / shares	$ 17.14	[1]
Granted, restricted stock (in shares)
Granted - weighted average grant date fair value , restricted stock (in dollars per share) | $ / shares		[1]
Canceled/forfeited/expired, restricted stock (in shares)
Canceled/forfeited/expired - weighted average grant date fair value, restricted stock (in dollars per share) | $ / shares		[1]
Vested, restricted stock (in shares)	(1,250)
Vested - weighted average grant date fair value, restricted stock (in dollars per share) | $ / shares	$ 30.81	[1]
Nonvested, restricted stock (in shares)	102,900
Nonvested - weighted average grant date fair value, restricted stock (in dollars per share) | $ / shares	$ 16.98	[1]
[1] The weighted-average grant date fair value was based on the closing price of the Company's stock on the date of the grant.

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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X

- 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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-SubTopic 10
-Section 50
-Paragraph 2
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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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-Paragraph 2
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- Definition

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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X

- 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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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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

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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

Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of non-vested options outstanding.

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Weighted average grant-date fair value of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options outstanding.

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