Note 9 - Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Notes Tables

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

	2015						2014						2013
	Class A			Class B			Class A			Class B			(Pre-Recap)
Expected dividend yield at date of grant	2.00	to	2.57%	5.29	to	5.72%	1.47	to	1.97%	4.03	to	4.87%	2.26	to	3.46%
Expected stock price volatility	30.86	to	34.87%	29.72	to	33.94%	27.52	to	32.03%	30.13	to	32.65%	30.34	to	30.51%
Risk-free interest rate	1.41	to	1.78%	1.41	to	1.78%	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	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, 2014		1,324,520		$	11.07
Granted		261,306		$	14.02
Exercised		(43,983	)	$	6.67			$	350
Forfeited		(56,105	)	$	13.12
Outstanding at December 31, 2015		1,485,738		$	11.65		6.00	$	6,686
Exercisable at December 31, 2015		1,041,990		$	11.11		5.22	$	5,263
Class B
Outstanding at December 31, 2014		213,470		$	24.32
Granted		43,551		$	34.47
Exercised		(7,330	)	$	15.38			$	151
Forfeited		(9,018	)	$	27.61
Outstanding at December 31, 2015		240,673		$	26.31		6.06	$	2,532
Exercisable at December 31, 2015		167,663		$	25.10		5.29	$	2,041

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		110,646		$	11.10		18,441		$	36.42
Granted		89,416		$	13.51		14,902		$	36.72
Forfeited		(16,248	)	$	5.39		(2,708	)	$	32.31
Outstanding at December 31, 2015		183,814		$	12.78		30,635		$	36.93