Note J - Equity-based Compensation (Details Textual) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended	90 Months Ended
Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Number of Equity Incentive Plans from Which Future Equity Awards May Be Granted	2		2		2
Share-based Compensation Arrangement by Share-based Payment Award Number of Employee Purchase Plans	1		1		1
Share Price \| $ / shares	$ 14.36		$ 14.36		$ 14.36
Share-based Payment Arrangement, Expense \| $	$ 2,060	$ 1,660	$ 3,965	$ 3,359
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total \| $	$ 8,681		$ 8,681		$ 8,681
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	377,000		377,000		377,000
Equity Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,728,000		1,728,000		1,728,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares	$ 12.58	$ 11.34
Share-based Compensation Arrangement by Share-based Payment Award, Weighted Average Pre Vest Cancel Rate	4.62%	3.69%
Employee Stock Option and Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares	$ 0	$ 3.49
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		4 years 266 days
Stock Appreciation Rights (SARs) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares to be Issued Upon Exercise of Outstanding Awards	1,875,000		1,875,000		1,875,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant as Percentage of Company Outstanding Common Stock					50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercisable, Number	588,000		588,000		588,000

The number of employee purchase plans held by the entity.

No definition available.

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- Definition

Represents the number of equity incentive plans, as of the balance sheet date, from which equity awards may be granted in the future.

+ References

No definition available.

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Share-based compensation arrangement by share-based payment award, number of shares available for grant as percentage of company outstanding common stock

+ References

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- Definition

Share-based compensation arrangement by share-based payment award number of shares to be issued upon exercise of outstanding awards

+ References

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- Definition

Represents the number of exercisable options and stock appreciation rights related to a share-based compensation arrangement.

+ References

No definition available.

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- Definition

Weighted average pre vest cancellation rate.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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).

+ References

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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- Definition

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

+ References

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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