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Note 9 - Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2015

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

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

		Nine Months Ended September 30,
		2015								2014
		Shares				Weighted-Average Exercise Price				Shares				Weighted-Average Exercise Price
Beginning balance			759,683			$	11.36				503,834			$	10.41
Issued			-				-				21,000				32.77
Exercised			(377,357	)			12.73				(64,926	)			16.78
Forfeited			(12,380	)			29.58				(110	)			5.76
Expired			(8,476	)			17.32				(1,225	)			9.00
Ending balance			361,470			$	9.16				458,573			$	10.54

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

																Weighted-Average
Outstanding:								Stock Options				Weighted-Average				Remaining
Range of Exercise Prices								Outstanding				Exercise Price				Contractual Life
$	5.76			$	9.21				221,669			$	5.76				3.28
$	9.22			$	15.47				108,611				12.40				2.15
$	15.48			$	22.66				18,794				19.28				7.75
$	22.67			$	32.36				12,396				26.18				2.19
									361,470			$	9.16				3.13

Exercisable:								Stock Options				Weighted-Average
Range of Exercise Prices								Exercisable				Exercise Price
$	5.76			$	9.21				164,759			$	5.76
$	9.22			$	15.47				101,941				12.51
$	15.48			$	22.66				15,164				19.60
$	22.67			$	32.36				10,896				26.36
									292,760			$	9.60

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

		Nine Months Ended				Years Ended December 31,
		September 30, 2015				2014				2013
Expected volatility			N/A				34.25	%			34.12	%
Weighted-Average volatility			N/A				34.25	%			34.12	%
Expected dividends			0.0	%			0.0	%			0.0	%
Expected term (in years)			N/A				9.4				7.5
Risk-free rate			N/A				2.26	%			1.31	%
Weighted-average fair value (grant date)			N/A			$	13.49			$	7.83

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

		Nine Months Ended September 30,
		2015								2014
		Shares				Weighted- Average Grant Date Fair Value				Shares				Weighted- Average Grant Date Fair Value
Unvested at beginning			509,336			$	21.58				614,580			$	18.71
Issued			78,070				36.06				78,947				33.24
Forfeited			(4,150	)			31.83				(832	)			23.59
Vested			(195,503	)			20.74				(184,921	)			17.54
Unvested at end			387,753			$	24.81				507,774			$	21.33

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

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