Note 11 - Net Income Per Share of Class A and Class B Common Stock (Detail) - Earnings Per Share Reconciliation (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Numerator:
Income from continuing operations applicable to common stockholders	$ 21,882	$ 16,634
Denominator:
Weighted average number of shares outstanding used to calculate basic income per share (in Shares)	25,626	25,986
Weighted average number of shares outstanding used to calculate diluted income per share from continuing operations (in Shares)	26,054	26,478
Basic income per share from continuing operations applicable to common stockholders (in Dollars per share)	$ 0.85	$ 0.64
Diluted income per share from continuing operations applicable to common stockholders (in Dollars per share)	$ 0.84	$ 0.63
Basic [Member] \| Common Class A [Member]
Numerator:
Distributed income applicable to common stockholders		(1,552)
Numerator:
Distributed income applicable to common stockholders		1,552
Basic [Member] \| Common Class B [Member]
Numerator:
Distributed income applicable to common stockholders		(262)
Numerator:
Distributed income applicable to common stockholders		262
Distributed [Member] \| Common Class A [Member]
Numerator:
Reallocation of income as a result of conversion of dilutive stock options		5
Reallocation of income due to conversion of Class B to Class A		257
Distributed [Member] \| Common Class B [Member]
Numerator:
Reallocation of income as a result of conversion of dilutive stock options		(5)
Diluted [Member] \| Common Class A [Member]
Numerator:
Distributed income applicable to common stockholders		(1,814)
Numerator:
Distributed income applicable to common stockholders		1,814
Diluted [Member] \| Common Class B [Member]
Numerator:
Distributed income applicable to common stockholders		(257)
Numerator:
Distributed income applicable to common stockholders		257
Undistributed [Member] \| Common Class A [Member]
Numerator:
Reallocation of income as a result of conversion of dilutive stock options	39	39
Reallocation of income due to conversion of Class B to Class A	2,318	2,098
Undistributed [Member] \| Common Class B [Member]
Numerator:
Reallocation of income as a result of conversion of dilutive stock options	(39)	(39)
Stock Options [Member] \| Common Class A [Member]
Antidilutive Securities
Shares issuable pursuant to stock options not included since they were antidilutive (in Shares)	20	90
Common Class A [Member]
Numerator:
Income from continuing operations applicable to common stockholders	19,525	14,235
Undistributed income from continuing operations applicable to common stockholders	19,525	12,683
Denominator:
Weighted average number of shares outstanding used to calculate basic income per share (in Shares)	22,866	22,238
Weighted average number of shares from stock options (in Shares)	428	492
Conversion of Class B to Class A common shares outstanding (in Shares)	2,760	3,748
Weighted average number of shares outstanding used to calculate diluted income per share from continuing operations (in Shares)	26,054	26,478
Basic income per share from continuing operations applicable to common stockholders (in Dollars per share)	$ 0.85	$ 0.64
Basic distributed income per share from continuing operations applicable to common stockholders (in Dollars per share)		$ (0.07)
Basic undistributed income per share from continuing operations applicable to common stockholders (in Dollars per share)	$ 0.85	$ 0.57
Diluted income per share from continuing operations applicable to common stockholders (in Dollars per share)	$ 0.84	$ 0.63
Diluted distributed income per share from continuing operations applicable to common stockholders (in Dollars per share)		$ (0.07)
Diluted undistributed income per share from continuing operations applicable to common stockholders (in Dollars per share)	$ 0.84	$ 0.56
Numerator:
Diluted undistributed income from continuing operations applicable to common stockholders	21,882	14,820
Common Class B [Member]
Numerator:
Income from continuing operations applicable to common stockholders	2,357	2,399
Undistributed income from continuing operations applicable to common stockholders	2,357	2,137
Denominator:
Weighted average number of shares outstanding used to calculate basic income per share (in Shares)	2,760	3,748
Weighted average number of shares outstanding used to calculate diluted income per share from continuing operations (in Shares)	2,760	3,748
Basic income per share from continuing operations applicable to common stockholders (in Dollars per share)	$ 0.85	$ 0.64
Basic distributed income per share from continuing operations applicable to common stockholders (in Dollars per share)		$ (0.07)
Basic undistributed income per share from continuing operations applicable to common stockholders (in Dollars per share)	$ 0.85	$ 0.57
Diluted income per share from continuing operations applicable to common stockholders (in Dollars per share)	$ 0.84	$ 0.63
Diluted distributed income per share from continuing operations applicable to common stockholders (in Dollars per share)		$ (0.07)
Diluted undistributed income per share from continuing operations applicable to common stockholders (in Dollars per share)	$ 0.84	$ 0.56
Numerator:
Diluted undistributed income from continuing operations applicable to common stockholders	$ 2,318	$ 2,098

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The earnings attributable to each security on the basis that all of the earnings for the period had been distributed (to the extent that each security may share in earnings). This is the earnings amount which reflects the participation rights in undistributed earnings of each security.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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