Note 2 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2015

Accounting Policies [Abstract]

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

	Three months ended				Nine months ended
	September 30, 2014		September 30, 2015		September 30, 2014		September 30, 2015
Net income	$	3,415	$	7,155	$	6,658	$	1,316
Basic shares outstanding:
Common stock		39,251		41,384		38,259		40,936
Diluted shares outstanding:
Common stock		39,251		41,384		38,259		40,936
Dilutive securities (1)		2,396		1,774		2,638		2,045
Total		41,647		43,158		40,897		42,981

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		(49,881	)		22.96
Options exercised		(1,115,291	)		12.32
Outstanding at September 30, 2015		3,835,775		$	13.27
Exercisable at September 30, 2015		3,361,732		$	10.74		5.5	$	62,747

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		823,601			40.30
Awards vested		(447,168	)		27.46
Awards forfeited		(22,923	)		33.42
Non-vested awards at September 30, 2015		1,233,943		$	34.49

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 September 30, 2015
Financial instruments:
Foreign currency derivative asset	$	—	$	2,351	$	—		$	2,351

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		(18,818	)		6,201			(12,617	)
Tax (expense) benefit		6,399			(2,452	)		3,947
Total activity in 2015		(12,419	)		3,749			(8,670	)
Balance at September 30, 2015	$	(30,240	)	$	7,194		$	(23,046	)