Note 2 - Investment Securities (Details) - Unrealized Loss Positions of Available-for-sale Securities (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Note 2 - Investment Securities (Details) - Unrealized Loss Positions of Available-for-sale Securities [Line Items]
Securities available-for-sale in a continuous unrealized loss position, less than 12 months, fair value	$ 9,255	$ 27,893
Securities available-for-sale in a continuous unrealized loss position, less than 12 months, unrealized loss	(111)	(1,158)
Securities available-for-sale in a continuous unrealized loss position, 12 months or more, fair value	14,058	4,124
Securities available-for-sale in a continuous unrealized loss position, 12 months or more, unrealized loss	(331)	(245)
Securities available-for-sale in a continuous unrealized loss position, fair value	23,313	32,017
Securities available-for-sale in a continuous unrealized loss position, unrealized loss	(442)	(1,403)
US Government Agencies Debt Securities [Member]
Note 2 - Investment Securities (Details) - Unrealized Loss Positions of Available-for-sale Securities [Line Items]
Securities available-for-sale in a continuous unrealized loss position, less than 12 months, fair value	7,147	9,676
Securities available-for-sale in a continuous unrealized loss position, less than 12 months, unrealized loss	(57)	(341)
Securities available-for-sale in a continuous unrealized loss position, 12 months or more, fair value	6,062	1,897
Securities available-for-sale in a continuous unrealized loss position, 12 months or more, unrealized loss	(168)	(99)
Securities available-for-sale in a continuous unrealized loss position, fair value	13,209	11,573
Securities available-for-sale in a continuous unrealized loss position, unrealized loss	(225)	(440)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 2 - Investment Securities (Details) - Unrealized Loss Positions of Available-for-sale Securities [Line Items]
Securities available-for-sale in a continuous unrealized loss position, less than 12 months, fair value	562	5,964
Securities available-for-sale in a continuous unrealized loss position, less than 12 months, unrealized loss	(2)	(134)
Securities available-for-sale in a continuous unrealized loss position, 12 months or more, fair value	4,252	1,042
Securities available-for-sale in a continuous unrealized loss position, 12 months or more, unrealized loss	(72)	(26)
Securities available-for-sale in a continuous unrealized loss position, fair value	4,814	7,006
Securities available-for-sale in a continuous unrealized loss position, unrealized loss	(74)	(160)
US States and Political Subdivisions Debt Securities [Member]
Note 2 - Investment Securities (Details) - Unrealized Loss Positions of Available-for-sale Securities [Line Items]
Securities available-for-sale in a continuous unrealized loss position, less than 12 months, fair value	1,546	12,253
Securities available-for-sale in a continuous unrealized loss position, less than 12 months, unrealized loss	(52)	(683)
Securities available-for-sale in a continuous unrealized loss position, 12 months or more, fair value	3,744	1,185
Securities available-for-sale in a continuous unrealized loss position, 12 months or more, unrealized loss	(91)	(120)
Securities available-for-sale in a continuous unrealized loss position, fair value	5,290	13,438
Securities available-for-sale in a continuous unrealized loss position, unrealized loss	$ (143)	$ (803)