Note 3 - Securities (Tables)

12 Months Ended

Dec. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities [Table Text Block]

			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
2014
U.S. Government agency debt obligations	$	194,894,000	$	1,612,000	$	(3,038,000	)	$	193,468,000
Mortgage-backed securities		92,656,000		1,123,000		(218,000	)		93,561,000
Municipal general obligation bonds		132,347,000		1,042,000		(307,000	)		133,082,000
Municipal revenue bonds		10,769,000		117,000		(13,000	)		10,873,000
Other investments		1,925,000		3,000		0			1,928,000
	$	432,591,000	$	3,897,000	$	(3,576,000	)	$	432,912,000
2013
U.S. Government agency debt obligations	$	108,279,000	$	263,000	$	(10,065,000	)	$	98,477,000
Mortgage-backed securities		12,456,000		1,102,000		0			13,558,000
Municipal general obligation bonds		16,488,000		388,000		(4,000	)		16,872,000
Municipal revenue bonds		878,000		38,000		0			916,000
Mutual funds		1,386,000		0		(31,000	)		1,355,000
	$	139,487,000	$	1,791,000	$	(10,100,000	)	$	131,178,000

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]

	Less than 12 Months				12 Months or More				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
Description of Securities	Value		Loss		Value		Loss		Value		Loss
2014
U.S. Government agency debt obligations	$	81,891,000	$	202,000	$	74,120,000	$	2,836,000	$	156,011,000	$	3,038,000
Mortgage-backed securities		49,940,000		218,000		0		0		49,940,000		218,000
Municipal general obligation bonds		54,104,000		307,000		0		0		54,104,000		307,000
Municipal revenue bonds		4,644,000		13,000		0		0		4,644,000		13,000
Other investments		0		0		0		0		0		0
	$	190,579,000	$	740,000	$	74,120,000	$	2,836,000	$	264,699,000	$	3,576,000
2013
U.S. Government agency debt obligations	$	57,117,000	$	5,798,000	$	29,679,000	$	4,267,000	$	86,796,000	$	10,065,000
Mortgage-backed securities		0		0		0		0		0		0
Municipal general obligation bonds		295,000		4,000		0		0		295,000		4,000
Municipal revenue bonds		0		0		0		0		0		0
Mutual funds		1,355,000		31,000		0		0		1,355,000		31,000
	$	58,767,000	$	5,833,000	$	29,679,000	$	4,267,000	$	88,446,000	$	10,100,000

Investments Classified by Contractual Maturity Date [Table Text Block]

	Weighted
	Average			Amortized		Fair
	Yield			Cost		Value
Due in one year or less		0.72	%	$	27,651,000	$	27,662,000
Due from one to five years		1.35			148,233,000		147,974,000
Due from five to ten years		2.99			70,282,000		70,191,000
Due after ten years		3.62			91,844,000		91,596,000
Mortgage-backed securities		1.79			92,656,000		93,561,000
Other investments		2.57			1,925,000		1,928,000
		2.17	%	$	432,591,000	$	432,912,000