Note 5 - Premises and Equipment (Details) - Components of Premises and Equipment (Parentheticals)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Minimum [Member] | Building [Member]
Property, Plant and Equipment [Line Items]
Useful lives	15 years	15 years
Minimum [Member] | Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Useful lives	3 years	3 years
Maximum [Member] | Building [Member]
Property, Plant and Equipment [Line Items]
Useful lives	50 years	50 years
Maximum [Member] | Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Useful lives	10 years	10 years