Note 9 - Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2012

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

	2012			2011			2010
Expected option life in years(1)		6.1			6.3			6.1
Expected stock price volatility percentage(2)		37	%		39	%		39	%
Risk-free interest rate percentage(3)		1.1	%		2.4	%		2.7	%
Expected dividend yield(4)		0.49	%		0.38	­%		0.05	%
Fair value as of the date of grant	$	7.22		$	8.54		$	9.31

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

	Shares			Weighted Average Exercise Price
Outstanding at December 31, 2011		690,768		$	17.62
Granted		96,250			20.48
Exercised		(111,954	)		8.65
Forfeited		(11,700	)		19.29
Outstanding at December 31, 2012		663,364		$	19.52
Exercisable at December 31, 2012		465,144		$	19.23

Schedule of Nonvested Share Activity [Table Text Block]

	Shares			Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life (in Years)
Service-based options:
Nonvested at December 31, 2011		204,740		$	8.23		5.0
Granted		96,250			7.22		6.9
Vested		(92,870	)		8.09		4.4
Forfeited		(9,900	)		7.94		4.5
Nonvested at December 31, 2012		198,220		$	7.82		5.2

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

	Shares			Weighted Average Grant Date Fair Value
Nonvested at December 31, 2011		60,166		$	19.76
Granted		39,500			20.95
Vested		(23,120)	(1)		20.24
Nonvested at December 31, 2012		76,546		$	20.23