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Note 8 - Stock-Based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Feb. 28, 2013
General Supplies and Expenses [Member] | Restricted Stock [Member]
Allocated Share-based Compensation Expense	$ 200	$ 100	$ 200	$ 100
Salaries Wages And Related Expenses [Member]
Allocated Share-based Compensation Expense	$ 600	$ 200
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	24,000
Proceeds from Stock Options Exercised	$ 300
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
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	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	726,353		726,353
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
Payments Related to Tax Withholding for Share-based Compensation			1,786	$ 174
Proceeds from Stock Options Exercised			$ 1,092

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.

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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.

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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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