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Note 8 - Stock-Based Compensation (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Feb. 28, 2013
Salaries Wages And Related Expenses [Member]
Allocated Share-based Compensation Expense	$ 300,000	$ 700,000	$ 900,000	$ 900,000
General Supplies and Expenses [Member] | Restricted Stock [Member]
Allocated Share-based Compensation Expense	$ 200,000	$ 100,000	$ 200,000	100,000
Third Amendment [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized					750,000
Second Amendment [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized					800,000
Common Class A [Member]
Shares Paid for Tax Withholding for Share Based Compensation			57,965
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased	$ 30.81		$ 30.81
Payments Related to Tax Withholding for Share-based Compensation			$ 1,800,000
Allocated Share-based Compensation Expense	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,550,000		1,550,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	731,557		731,557
Maximum Number of Shares of Class A Common Stock Awarded to any Participant in the Incentive Plan in any Calendar Year	200,000		200,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation			$ 1,757,000
Payments Related to Tax Withholding for Share-based Compensation			$ 1,786,000	$ 174,000

X

- Definition

The maximum number of shares of the Class A common stock that can be awarded to a participant in the incentive plan in any calendar-year.

+ References

No definition available.

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- Definition

Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



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-SubTopic 740



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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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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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

+ References

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- Definition

The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

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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

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