Note 5 - Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2015

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2015						2014
	Class A			Class B			Class A			Class B
Expected dividend yield at date of grant		2.57	%		5.72	%		1.47	%		4.87	%
Expected stock price volatility		34.87	%		33.94	%		32.03	%		32.65	%
Risk-free interest rate		1.78	%		1.78	%		2.37	%		2.37	%
Expected life of options (in years)		7			7			7			7

Schedule of Share-based Compensation, Activity [Table Text Block]

	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Terms (Years)		Aggregate Intrinsic Value (In thousands)
Class A
Outstanding at December 31, 2014		1,324,520		$	11.07
Granted		81,306		$	13.17
Exercised		(25,983	)	$	6.30			$	178
Forfeited		(56,105	)	$	13.12
Outstanding at March 31, 2015		1,323,738		$	11.21		6.22	$	4,740
Exercisable at March 31, 2015		879,990		$	10.24		5.25	$	4,019
Class B
Outstanding at December 31, 2014		213,470		$	24.32
Granted		13,551		$	35.48
Exercised		(4,330	)	$	14.82			$	89
Forfeited		(9,018	)	$	27.61
Outstanding at March 31, 2015		213,673		$	25.09		6.27	$	1,821
Exercisable at March 31, 2015		140,663		$	20.89		5.30	$	1,517

Schedule of Nonvested Share Activity [Table Text Block]

	Class A Shares Outstanding			Class A Weighted Average Grant Date Fair Value Per Share		Class B Shares Outstanding			Class B Weighted Average Grant Date Fair Value Per Share
Outstanding at December 31, 2014		110,647		$	11.10		18,441		$	36.42
Granted		52,660		$	13.17		8,776		$	35.48
Vested		--			--		--			--
Forfeited		(16,249	)	$	5.39		(2,708	)	$	32.31
Outstanding at March 31, 2015		147,058		$	12.47		24,509		$	36.54