Note 3 - Securities (Details) - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 87,760	$ 92,530
Gross Unrealized Gains	1,737	2,435
Gross Unrealized Losses	(647)	0
Estimated Fair Value	88,850	94,965
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,030	1,009
Gross Unrealized Gains	3	3
Gross Unrealized Losses	(178)	0
Estimated Fair Value	8,855	1,012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	78,730	91,521
Gross Unrealized Gains	1,734	2,432
Gross Unrealized Losses	(469)	0
Estimated Fair Value	$ 79,995	$ 93,953