Note 2 - Investment Securities (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Note 2 - Investment Securities (Details) [Line Items]
Payments to Acquire Available-for-sale Securities	$ 0	$ 0
Proceeds from Sale of Available-for-sale Securities	$ 0	$ 0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	8	11
Unrealized Holding Losses Depreciation Percentage from Amortized Cost	0.90%	1.30%
Municipal Deposits Securities [Member]
Note 2 - Investment Securities (Details) [Line Items]
Available-for-sale Securities Pledged as Collateral	$ 5,800,000	$ 7,400,000