Note 2 - Securities (Details)	3 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Investments, Debt and Equity Securities [Abstract]
Held-to-maturity Securities		$ 0			$ 0
Proceeds from Sale of Available-for-sale Securities	$ 5,900,000	5,934,000	$ 7,732,000	$ 7,700,000
Available-for-sale Securities, Gross Realized Losses	0			$ 9,000
Available-for-sale Securities, Gross Realized Gains	$ 0
Available-for-sale Securities Pledged as Collateral		$ 278,100,000			$ 263,100,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		45			80