Note 2 - Investments (Detail) - Unrealized Gains and Losses in Investments (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Amortized Cost	$ 343,924	$ 337,779
Unrealized Gains	6,382	4,555
Unrealized Losses	(77)	(150)
Carrying Value	350,229	342,184
US Government Agencies Debt Securities [Member]
Amortized Cost	110,398	132,534
Unrealized Gains	1,383	1,325
Unrealized Losses	0	(25)
Carrying Value	111,781	133,834
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	94,532	76,574
Unrealized Gains	1,908	1,238
Unrealized Losses	(18)	(23)
Carrying Value	96,422	77,789
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Amortized Cost	70,922	70,059
Unrealized Gains	2,097	1,080
Unrealized Losses	(2)	(87)
Carrying Value	73,017	71,052
Collateralized Mortgage Obligations [Member]
Amortized Cost	66,453	57,006
Unrealized Gains	989	854
Unrealized Losses	(57)	(15)
Carrying Value	67,385	57,845
Equity Securities, Other [Member]
Amortized Cost	1,619	1,606
Unrealized Gains	5	58
Unrealized Losses	0	0
Carrying Value	$ 1,624	$ 1,664

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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+ Details

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References+ Details

- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details