Note 7 - Investment Securities (Details) - Investment Securities Held-to-maturity - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
State and municipal securities	$ 147	$ 146
State and municipal securities	153	156
US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
State and municipal securities	147	146
State and municipal securities	6	10
State and municipal securities	$ 153	$ 156