Note 3 - Securities (Details) - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 88,034	$ 83,689
Gross Unrealized Gains	1,405	1,261
Gross Unrealized Losses	(581)	(882)
Estimated Fair Value	88,858	84,068
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,025	9,028
Gross Unrealized Gains	4	4
Gross Unrealized Losses	(160)	(180)
Estimated Fair Value	8,869	8,852
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	79,009	74,661
Gross Unrealized Gains	1,401	1,257
Gross Unrealized Losses	(421)	(702)
Estimated Fair Value	$ 79,989	$ 75,216