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Note 4 - Stock-Based Compensation (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended				12 Months Ended						24 Months Ended
	Sep. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2011	Dec. 31, 2012 Common Class A [Member]	Dec. 31, 2011 Common Class A [Member]	Dec. 31, 2012 Salaries, Wages, and Related Expenses [Member]	Dec. 31, 2011 Salaries, Wages, and Related Expenses [Member]	Dec. 31, 2012 Selling, General and Administrative Expenses [Member]	Dec. 31, 2011 Selling, General and Administrative Expenses [Member]	Dec. 31, 2011 Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)					800,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)		224,731
Allocated Share-based Compensation Expense								$ 1.2	$ 1.0	$ 0.1	$ 0.1	$ 0.1
Share-based Goods and Nonemployee Services Transaction, Tax Benefit			0.4	0.4
Shares Paid for Tax Withholding for Share Based Compensation (in Shares)			41,000			1,940	61,752
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in Dollars per share)				$ 6.87		$ 4.60	$ 9.02
Adjustments Related to Tax Withholding for Share-based Compensation			0.6	0.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value		0.1	2.2	1.6
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized				1.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares)	163,000			(163,000)
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	$ 1.3

X

- Definition

The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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X

- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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X

- Definition

The total fair value of equity-based awards 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.

+ References

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X

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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X

- 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.

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X

- Definition

As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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X

- Definition

The amount of income tax expense reduction and deferred tax asset recorded in the transaction in which equity securities were issued to pay for goods or nonemployee services.

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X

- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

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Number of share options (or share units) exercised during the current period.

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