Note 15 - Fair Values (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Available-for-sale securities:
Assets measured at fair value	$ 166,890		$ 186,986
Liabilities measured at fair value	3,259		3,224
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Assets measured at fair value	6,422		6,393
US Government Agencies Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value	6,422		6,393
Obligations of State and Political Subdivisions [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Assets measured at fair value	53,491		54,363
Obligations of State and Political Subdivisions [Member]
Available-for-sale securities:
Assets measured at fair value	53,491		54,363
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Assets measured at fair value	41,851		47,015
Residential Mortgage Backed Securities [Member]
Available-for-sale securities:
Assets measured at fair value	41,851		47,015
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Assets measured at fair value			1,467
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Assets measured at fair value	31,660		36,267
Corporate Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value	31,660		37,734
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Assets measured at fair value			1,104
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Assets measured at fair value	6,799		9,285
Commercial Mortgage Backed Securities [Member]
Available-for-sale securities:
Assets measured at fair value	6,799		10,389
Other Investment Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Assets measured at fair value	26,667	[1]	31,092	[1]
Other Investment Securities [Member]
Available-for-sale securities:
Assets measured at fair value	26,667	[1]	31,092	[1]
Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Assets measured at fair value			2,571
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Available-for-sale securities:
Liabilities measured at fair value	3,259		3,224
Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Assets measured at fair value	166,890		184,415
Liabilities measured at fair value	3,259		3,224
Interest Rate Swap [Member]
Available-for-sale securities:
Liabilities measured at fair value	$ 3,259		$ 3,224

[1] Principally consists of residential mortgage backed securities issued by both by governmental and nongovernmental agencies, and SBA pool securities.