Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

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

	2015			2014
Volatility		26.44	%		27.37	%
Risk free interest rate		1.64	%		1.68	%
Expected dividends	$	0.12		$	0.14
Annual dividend rate		2.05	%		2.22	%
Assumed forfeiture rate		—			—
Expected life (years)		7			7