Note 15 - Fair Values (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Available-for-sale securities:
Assets measured at fair value		$ 157,309	$ 186,986
Liabilities measured at fair value		3,136	3,224
Interest Rate Swap [Member]
Available-for-sale securities:
Liabilities measured at fair value		3,136	3,224
US Government Agencies Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value		3,998	6,393
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value		57,453	54,363
Residential Mortgage Backed Securities [Member]
Available-for-sale securities:
Assets measured at fair value		34,058	47,015
Corporate Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value		36,560	37,734
Commercial Mortgage Backed Securities [Member]
Available-for-sale securities:
Assets measured at fair value		9,266	10,389
Other Investment Securities [Member]
Available-for-sale securities:
Assets measured at fair value	[1]	15,974	31,092
Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Assets measured at fair value			2,571
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value			1,467
Fair Value, Inputs, Level 1 [Member] | Commercial Mortgage Backed Securities [Member]
Available-for-sale securities:
Assets measured at fair value			1,104
Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Assets measured at fair value		157,309	184,415
Liabilities measured at fair value		3,136	3,224
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Available-for-sale securities:
Liabilities measured at fair value		3,136	3,224
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value		3,998	6,393
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value		57,453	54,363
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Available-for-sale securities:
Assets measured at fair value		34,058	47,015
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Available-for-sale securities:
Assets measured at fair value		36,560	36,267
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage Backed Securities [Member]
Available-for-sale securities:
Assets measured at fair value		9,266	9,285
Fair Value, Inputs, Level 2 [Member] | Other Investment Securities [Member]
Available-for-sale securities:
Assets measured at fair value	[1]	$ 15,974	$ 31,092

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