Note 5 - Loans (Details) - Troubled Debt Restructurings With Subsequent Default (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Residential:
Troubled debt restructurings that subsequently defaulted, number of contracts	3	9	7
Troubled debt restructurings that subsequently defaulted, recorded investment	$ 2,032	$ 591	$ 1,677
Residential One To Four Family [Member]
Residential:
Troubled debt restructurings that subsequently defaulted, number of contracts	2	9	6
Troubled debt restructurings that subsequently defaulted, recorded investment	109	591	677
Commercial Portfolio Segment [Member]
Residential:
Troubled debt restructurings that subsequently defaulted, number of contracts	1
Troubled debt restructurings that subsequently defaulted, recorded investment	1,923
Commercial Real Estate Other Receivable [Member]
Residential:
Troubled debt restructurings that subsequently defaulted, number of contracts			1
Troubled debt restructurings that subsequently defaulted, recorded investment			$ 1,000