Note 9 - Allowance for Loan Losses and Credit Quality Information - Troubled Debt Restructuring (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
One to Four Family Porfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Recorded Investment	$ 428	$ 547
One to Four Family Porfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications, Recorded Investment	64	100
One to Four Family Porfolio Segment [Member]
Financing Receivable, Modifications, Recorded Investment	492	647
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Recorded Investment	503	511
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications, Recorded Investment	1,416	214
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications, Recorded Investment	1,919	725
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Recorded Investment	101	191
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications, Recorded Investment	512	541
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications, Recorded Investment	613	732
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Recorded Investment	318	369
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications, Recorded Investment	201	46
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications, Recorded Investment	519	415
Performing Financial Instruments [Member]
Financing Receivable, Modifications, Recorded Investment	1,350	1,618
Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications, Recorded Investment	2,193	901
Financing Receivable, Modifications, Recorded Investment	$ 3,543	$ 2,519