Note 14 - Income Taxes (Details) - Difference Between Statutory and Effective Tax Rates	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Difference Between Statutory and Effective Tax Rates [Abstract]
U.S. federal statutory tax rate	35.00%	35.00%
Tax exempt interest income	(1.40%)	(1.50%)
Tax credits	(2.40%)	(1.50%)
Cash surrender value of life insurance	(0.60%)	(1.30%)
State income taxes, net of federal benefit	0.80%	0.90%
Other, net	0.30%	(0.20%)
Effective tax rate	31.70%	31.40%