Note 2 - Securities (Details) - Available-for-sale Securities - USD ($)		Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost		$ 339,690,000	$ 344,796,000
Available-for-sale Securities, Gross Unrealized Gains		4,954,000	4,265,000
Available-for-sale Securities, Gross Unrealized Losses		(839,000)	(2,069,000)
Securities available for sale	[1]	343,805,000	346,992,000
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost		141,400,000	146,660,000
Available-for-sale Securities, Gross Unrealized Gains		2,076,000	1,932,000
Available-for-sale Securities, Gross Unrealized Losses		(580,000)	(1,552,000)
Securities available for sale		142,896,000	147,040,000
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost		61,744,000	66,670,000
Available-for-sale Securities, Gross Unrealized Gains		828,000	708,000
Available-for-sale Securities, Gross Unrealized Losses		(111,000)	(304,000)
Securities available for sale		62,461,000	67,074,000
Municipal General Obligation Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost		125,794,000	120,679,000
Available-for-sale Securities, Gross Unrealized Gains		1,948,000	1,549,000
Available-for-sale Securities, Gross Unrealized Losses		(148,000)	(205,000)
Securities available for sale		127,594,000	122,023,000
Municipal Revenue Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost		8,798,000	8,841,000
Available-for-sale Securities, Gross Unrealized Gains		87,000	76,000
Available-for-sale Securities, Gross Unrealized Losses		0	(3,000)
Securities available for sale		8,885,000	8,914,000
Other Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost		1,954,000	1,946,000
Available-for-sale Securities, Gross Unrealized Gains		15,000	0
Available-for-sale Securities, Gross Unrealized Losses		0	(5,000)
Securities available for sale		$ 1,969,000	$ 1,941,000

[1] See Note 11 for a description of the fair value hierarchy as well as a disclosure of levels for classes of financial assets and liabilities.