Note 5 - Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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

	2014 Class A	2014 Class B	2013 Pre-May 2013 Recapitalization
Expected dividend yield at date of grant	1.47 to 1.97%	4.03 to 4.87%	2.26 to 3.46%
Expected stock price volatility	27.52 to 32.03%	30.13 to 32.65%	30.34 to 30.51%
Risk-free interest rate	1.63 to 2.37%	1.63 to 2.37%	0.55 to 1.07%
Expected life of options (in years)	5 to 7	5 to 7	4 to 6

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, 2013		1,444,845		$	10.21
Granted		204,166		$	15.41
Exercised		(110,625	)	$	6.60			$	1,268
Forfeited		(183,896	)	$	12.40
Outstanding at June 30, 2014		1,354,490		$	10.99		6.72	$	4,765
Exercisable at June 30, 2014		817,383		$	10.58		5.95	$	3,204
Class B
Outstanding at December 31, 2013		234,802		$	20.76
Granted		32,217		$	43.24
Exercised		(18,437	)	$	14.93			$	400
Forfeited		(30,117	)	$	23.82
Outstanding at June 30, 2014		218,465		$	24.14		6.76	$	3,414
Exercisable at June 30, 2014		130,229		$	21.44		6.00	$	2,301

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, 2013		60,609	$	5.77		10,101	$	34.65
Granted		--		--		--		--
Vested		--		--		--		--
Forfeited		(23,468)	$	6.39		(3,911)	$	38.35
Outstanding at June 30, 2014		37,141	$	5.39		6,190	$	32.31