Note 3 - Securities (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

Available-for-sale Securities [Table Text Block]

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
2016
U.S. Government agency debt obligations	$	159,271,000	$	106,000	$	(7,337,000	)	$	152,040,000
Mortgage-backed securities		47,329,000		486,000		(423,000	)		47,392,000
Municipal general obligation bonds		120,284,000		312,000		(1,549,000	)		119,047,000
Municipal revenue bonds		7,699,000		23,000		(91,000	)		7,631,000
Other investments		1,979,000		0		(29,000	)		1,950,000
	$	336,562,000	$	927,000	$	(9,429,000	)	$	328,060,000
2015
U.S. Government agency debt obligations	$	146,660,000	$	1,932,000	$	(1,552,000	)	$	147,040,000
Mortgage-backed securities		66,670,000		708,000		(304,000	)		67,074,000
Municipal general obligation bonds		120,679,000		1,549,000		(205,000	)		122,023,000
Municipal revenue bonds		8,841,000		76,000		(3,000	)		8,914,000
Other investments		1,946,000		0		(5,000	)		1,941,000
	$	344,796,000	$	4,265,000	$	(2,069,000	)	$	346,992,000

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

	Less than 12 Months				12 Months or More				Total
Description of Securities	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
2016
U.S. Government agency debt obligations	$	110,160,000	$	7,172,000	$	5,073,000	$	165,000	$	115,233,000	$	7,337,000
Mortgage-backed securities		3,670,000		4,000		37,072,000		419,000		40,742,000		423,000
Municipal general obligation bonds		65,895,000		1,360,000		27,734,000		189,000		93,629,000		1,549,000
Municipal revenue bonds		1,921,000		90,000		206,000		1,000		2,127,000		91,000
Other investments		1,479,000		29,000		0		0		1,479,000		29,000
	$	183,125,000	$	8,655,000	$	70,085,000	$	774,000	$	253,210,000	$	9,429,000
2015
U.S. Government agency debt obligations	$	0	$	0	$	76,496,000	$	1,552,000	$	76,496,000	$	1,552,000
Mortgage-backed securities		18,025,000		69,000		34,660,000		235,000		52,685,000		304,000
Municipal general obligation bonds		1,981,000		4,000		30,134,000		201,000		32,115,000		205,000
Municipal revenue bonds		0		0		1,134,000		3,000		1,134,000		3,000
Other investments		1,446,000		5,000		0		0		1,446,000		5,000
	$	21,452,000	$	78,000	$	142,424,000	$	1,991,000	$	163,876,000	$	2,069,000

Investments Classified by Contractual Maturity Date [Table Text Block]

	Weighted Average Yield		Amortized Cost		Fair Value
Due in one year or less		1.24%	$	35,608,000	$	35,638,000
Due from one to five years		2.09		81,073,000		80,872,000
Due from five to ten years		2.65		84,422,000		81,587,000
Due after ten years		2.84		86,151,000		80,621,000
Mortgage-backed securities		1.77		47,329,000		47,392,000
Other investments		2.66		1,979,000		1,950,000
		2.31%	$	336,562,000	$	328,060,000