Note 2 - Securities (Details) - Unrealized Gains and Losses in Investments (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Note 2 - Securities (Details) - Unrealized Gains and Losses in Investments [Line Items]
Amortized Cost	$ 358,732	$ 343,212
Unrealized Gains	2,638	2,523
Unrealized Losses	(1,507)	(2,133)
Carrying Value	359,863	343,602
US Government Agencies Debt Securities [Member]
Note 2 - Securities (Details) - Unrealized Gains and Losses in Investments [Line Items]
Amortized Cost	109,838	101,444
Unrealized Gains	358	445
Unrealized Losses	(344)	(285)
Carrying Value	109,852	101,604
US States and Political Subdivisions Debt Securities [Member]
Note 2 - Securities (Details) - Unrealized Gains and Losses in Investments [Line Items]
Amortized Cost	148,443	147,421
Unrealized Gains	868	756
Unrealized Losses	(880)	(1,513)
Carrying Value	148,431	146,664
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Note 2 - Securities (Details) - Unrealized Gains and Losses in Investments [Line Items]
Amortized Cost	67,079	58,533
Unrealized Gains	1,002	961
Unrealized Losses	(218)	(235)
Carrying Value	67,863	59,259
Collateralized Mortgage Obligations [Member]
Note 2 - Securities (Details) - Unrealized Gains and Losses in Investments [Line Items]
Amortized Cost	31,808	34,225
Unrealized Gains	410	361
Unrealized Losses	(65)	(100)
Carrying Value	32,153	34,486
Equity Securities, Other [Member]
Note 2 - Securities (Details) - Unrealized Gains and Losses in Investments [Line Items]
Amortized Cost	1,564	1,589
Unrealized Gains	0	0
Unrealized Losses	0	0
Carrying Value	$ 1,564	$ 1,589