Note 2 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2015

Accounting Policies [Abstract]

Schedule of Weighted Average Number of Shares [Table Text Block]

	Three months ended June 30, 2014		Six months ended June 30, 2014
Net income	$	3,532	$	3,243
Basic shares outstanding:
Common stock		38,452		37,764
Diluted shares outstanding:
Common stock		38,452		37,764
Dilutive securities (1)		2,488		2,758
Total		40,940		40,522

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

	2015
Volatility		48.59%
Expected life (years)		6.00
Risk-free interest rate		2.01%
Dividend yield		—
Fair value	$19.30	–	$19.37

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

	Number of options			Weighted average exercise price		Weighted average remaining contractual life (years)		Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2014		4,965,947		$	12.96
Options granted		35,000			40.20
Options forfeited		(38,766	)		22.67
Options exercised		(819,097	)		13.98
Outstanding at June 30, 2015		4,143,084		$	12.90
Exercisable at June 30, 2015		3,595,175		$	10.15		5.6	$	104,071

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

	Number of awards			Weighted average grant date fair value
Non-vested awards at December 31, 2014		880,433		$	25.46
Awards granted		801,578			40.44
Awards vested		(334,997	)		25.22
Awards forfeited		(15,559	)		32.07
Non-vested awards at June 30, 2015		1,331,455		$	34.46

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Level 1		Level 2			Level 3			Total
As of December 31, 2014
Financial instruments:
Contingent consideration	$	—	$	—		$	(6,587	)	$	(6,587	)
Foreign currency derivative asset		—		272			—			272
As of June 30, 2015
Financial instruments:
Contingent consideration	$	—	$	—		$	(4,567	)	$	(4,567	)
Foreign currency derivative liability		—		(2,126	)		—			(2,126	)

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	Foreign Currency Translation			Net investment hedge - foreign exchange contract			Total
Balance at December 31, 2014	$	(17,821	)	$	3,445		$	(14,376	)
Change during 2015:
Before-tax amount		(5,895	)		532			(5,363	)
Tax (expense) benefit		1,510			(210	)		1,300
Total activity in 2015		(4,385	)		322			(4,063	)
Balance at June 30, 2015	$	(22,206	)	$	3,767		$	(18,439	)