Note 3 - Securities (Details) - Amortized Cost and Estimated Fair Value of Held-to-Maturity Securities (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 22,620	$ 22,826
Gross Unrecognized Gains	615	579
Gross Unrecognized Losses	(343)	(421)
Estimated Fair Value	22,892	22,984
US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	22,609	22,814
Gross Unrecognized Gains	615	579
Gross Unrecognized Losses	(343)	(421)
Estimated Fair Value	22,881	22,972
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	11	12
Estimated Fair Value	$ 11	$ 12