Note 3 - Securities (Details) - Securities Held-to-Maturity - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 21,433	$ 22,820
Gross Unrecognized Gains	909	939
Gross Unrecognized Losses	(232)	(189)
Estimated Fair Value	22,110	23,570
US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	21,426	22,811
Gross Unrecognized Gains	909	939
Gross Unrecognized Losses	(232)	(189)
Estimated Fair Value	22,103	23,561
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	7	9
Estimated Fair Value	$ 7	$ 9