Note 13 - Stockholders' Equity (Details) - Weighted Average Fair Value Assumptions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Weighted Average Fair Value Assumptions [Abstract]
Volatility		49.04%	43.14%	46.24%
Risk-free interest rate		1.96%	1.85%	1.39%
Dividend yield		0.00%	0.00%	0.00%
Pre-vest cancellation rate *)	[1]	3.95%	4.17%	3.48%
Post-vest cancellation rate **)	[2]	3.86%	4.09%	2.52%
Suboptimal exercise factor ***)	[3]	1.46%	1.61%	1.81%
Expected life (years)		4 years 156 days	3 years 98 days	4 years 240 days

[1] The pre-vest cancellation rate was calculated on an annual basis and is presented here on an annual basis.

[2] The post-vest cancellation rate was calculated on a monthly basis and is presented here on an annual basis.

[3] The ratio of the stock price to strike price at the time of exercise of the option.