Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

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

	Year ended December 31, 2014
Net income	$	10,494
Weighted average basic shares outstanding:
Common stock		38,656
Weighted average diluted shares outstanding:
Common stock		38,656
Dilutive securities		2,576
Total		41,232

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

	2012					2013					2014
Volatility		45.86	–	48.36	%		48.37	–	49.10	%		48.59	–	49.27	%
Expected life (years)			6.00					6.00					6.00
Risk-free interest rate		0.83	–	1.15	%		0.97	–	1.73	%		1.81	–	2.08	%
Dividend yield			—					—					—
Fair value	$	4.23	–	6.54		$	6.63	–	12.61		$	14.71	–	17.26

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, 2011		7,371,304		$	12.48
Options granted		2,933,701			10.28
Options forfeited		(552,228	)		15.28
Options exercised		(289,120	)		8.46
Outstanding at December 31, 2012		9,463,657		$	11.76
Options granted		621,100			18.16
Options forfeited		(520,139	)		15.38
Options exercised		(2,229,873	)		10.85
Outstanding at December 31, 2013		7,334,745		$	12.33
Options granted		629,775			32.72
Options forfeited		(204,348	)		20.42
Options exercised		(2,794,225	)		15.20
Outstanding at December 31, 2014		4,965.947		$	12.96		6.6	$	142,193
Exercisable at December 31, 2014		3,676,807		$	9.95		6.0	$	116,347
Expected to vest after December 31, 2014		1,095,769		$	21.54		8.3	$	21,969

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, 2011		42,423		$	13.55
Awards granted		187,270			13.73
Awards vested		(40,281	)		13.74
Awards forfeited		—			—
Non-vested awards at December 31, 2012		189,412		$	13.68
Awards granted		668,885			15.78
Awards vested		(77,513	)		13.30
Awards forfeited		(26,570	)		14.06
Non-vested awards at December 31, 2013		754,214		$	15.57
Awards granted		573,818			34.08
Awards vested		(376,753	)		17.39
Awards forfeited		(70,846	)		33.00
Non-vested awards at December 31, 2014		880,433		$	25.46

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, 2013
Financial instruments:
Contingent consideration	$	—	$	—		$	(4,834	)	$	(4,834	)
Foreign currency derivative asset		—		61			—			61
Foreign currency derivative liability		—		(683	)		—			(683	)
As of December 31, 2014
Financial instruments:
Contingent consideration	$	—	$	—		$	(6,587	)	$	(6,587	)
Foreign currency derivative asset		—		272			—			272

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

	Foreign Currency Translation			Net investment hedge - foreign exchange contract			Net investment hedge - Australian denominated debt			Total
Balance at December 31, 2012	$	3,356		$	—		$	(173	)	$	3,183
Change during 2013:
Before-tax amount		(14,706	)		799			626			(13,281	)
Tax (expense) benefit		4,725			(316	)		(248	)		4,161
Total activity in 2013		(9,981	)		483			378			(9,120	)
Balance at December 31, 2013	$	(6,625	)	$	483		$	205		$	(5,937	)
Change during 2014:
Before-tax amount		(16,923	)		4,900			—			(12,023	)
Tax (expense) benefit		5,522			(1,938	)		—			3,584
Total activity in 2014		(11,401	)		2,962			—			(8,439	)
Balance at December 31, 2014	$	(18,026	)	$	3,445		$	205		$	(14,376	)