Note 15 - Fair Values (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Available-for-sale securities
Assets measured at fair value	$ 204,010		$ 216,640
Liabilities measured at fair value	2,946		2,890
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities
Assets measured at fair value	0		0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Assets measured at fair value	6,300		6,264
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities
Assets measured at fair value	0		0
US Government Agencies Debt Securities [Member]
Available-for-sale securities
Assets measured at fair value	6,300		6,264
Obligations Of States And Political Subdivisions [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Assets measured at fair value	56,454		59,209
Obligations Of States And Political Subdivisions [Member]
Available-for-sale securities
Assets measured at fair value	56,454		59,209
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Assets measured at fair value	53,105		62,991
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]
Available-for-sale securities
Assets measured at fair value	53,105		62,991
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Assets measured at fair value	49,553		48,230
Corporate Debt Securities [Member]
Available-for-sale securities
Assets measured at fair value	49,553		48,230
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Assets measured at fair value	10,406		10,472
Commercial Mortgage Backed Securities [Member]
Available-for-sale securities
Assets measured at fair value	10,406		10,472
Other Investment Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Assets measured at fair value	28,192	[1]	29,474	[1]
Other Investment Securities [Member]
Available-for-sale securities
Assets measured at fair value	28,192	[1]	29,474	[1]
Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities
Assets measured at fair value	0		0
Liabilities measured at fair value	0		0
Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Assets measured at fair value	204,010		216,640
Liabilities measured at fair value	2,946		2,890
Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities
Assets measured at fair value	0		0
Liabilities measured at fair value	$ 0		$ 0

[1] Principally represents residential mortgage backed securities issued by both by governmental and nongovernmental agencies, and other asset backed securities.