Note 2 - Securities (Details) - Unrealized Gains and Losses in Investments (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Note 2 - Securities (Details) - Unrealized Gains and Losses in Investments [Line Items]
Amortized Cost	$ 356,203	$ 348,190
Unrealized Gains	3,329	5,658
Unrealized Losses	(2,111)	(170)
Carrying Value	357,421	353,678
US Government Agencies Debt Securities [Member]
Note 2 - Securities (Details) - Unrealized Gains and Losses in Investments [Line Items]
Amortized Cost	107,919	105,629
Unrealized Gains	641	1,271
Unrealized Losses	(224)	(15)
Carrying Value	108,336	106,885
US States and Political Subdivisions Debt Securities [Member]
Note 2 - Securities (Details) - Unrealized Gains and Losses in Investments [Line Items]
Amortized Cost	147,202	116,123
Unrealized Gains	811	1,786
Unrealized Losses	(1,656)	(95)
Carrying Value	146,357	117,814
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Note 2 - Securities (Details) - Unrealized Gains and Losses in Investments [Line Items]
Amortized Cost	62,127	64,550
Unrealized Gains	1,149	1,729
Unrealized Losses	(173)	(2)
Carrying Value	63,103	66,277
Collateralized Mortgage Obligations [Member]
Note 2 - Securities (Details) - Unrealized Gains and Losses in Investments [Line Items]
Amortized Cost	37,344	60,278
Unrealized Gains	499	810
Unrealized Losses	(58)	(58)
Carrying Value	37,785	61,030
Equity Securities [Member]
Note 2 - Securities (Details) - Unrealized Gains and Losses in Investments [Line Items]
Amortized Cost	1,611	1,610
Unrealized Gains	229	62
Unrealized Losses	0	0
Carrying Value	$ 1,840	$ 1,672