Note 9 - Borrowings - Outstanding Advances (Details) (Parentheticals)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Matures 03/30/2018 at 1.72 Percent [Member]
Maturity date on fixed rate advance	Mar. 30, 2018	Mar. 30, 2018
Interest rate, fixed	1.72%	1.72%
Matures 04/01/2019 at 2.00 Percent [Member]
Maturity date on fixed rate advance	Apr. 01, 2019	Apr. 01, 2019
Interest rate, fixed	2.00%	2.00%
Matures 10/03/2022 at 1.48 Percent [Member]
Maturity date on fixed rate advance	Oct. 03, 2022	Oct. 03, 2022
Interest rate, fixed	1.48%	1.48%