Note 9 - Equity-based Compensation (Details) - Weighted Average Assumptions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Weighted Average Assumptions [Abstract]
Volatility (1)	[1]	46.02%	49.04%
Risk-free interest rate (1)	[1]	2.29%	1.96%
Dividend yield (1)	[1]	0.00%	0.00%
Pre-vest cancellation rate		3.43%	3.62%
Post-vest cancellation rate (1)	[1]	3.44%	3.86%
Suboptimal exercise factor (1)	[1]	1.69%	1.46%

[1] The RSUs granted during the three months ended March 31, 2016 and 2015 were not included in the average calculated numbers in thetable above since those assumptions were not used in the RSU calculation.