Note 11 - Summary of Assumptions Used to Value Options Granted (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Risk–free interest rate	0.71%	0.52%
Expected volatility	16.50%	17.30%
Expected life, in years (years)	2 years 73 days	2 years 73 days
Expected dividend yield	2.73%	2.68%