Note 16 - Assumptions Used in Determining the Fair Value of Stock Options for Grants (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Minimum [Member]
Expected volatility	41.84%	35.14%	44.17%
Expected term (years)	1 year 91 days	1 year 273 days	1 year 91 days
Risk-free interest rate	0.24%	0.43%	0.12%
Maximum [Member]
Expected volatility	58.25%	46.32%	71.58%
Expected term (years)	6 years 302 days	4 years 273 days	4 years 273 days
Risk-free interest rate	1.93%	1.50%	1.37%