Note 15 - Fair Values (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Available-for-sale securities
Assets measured at fair value		$ 174,251	$ 159,030
US Government Agencies Debt Securities [Member]
Available-for-sale securities
Assets measured at fair value		3,915	3,943
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities
Assets measured at fair value		61,288	61,104
Residential Mortgage Backed Securities [Member]
Available-for-sale securities
Assets measured at fair value		51,721	32,137
Corporate Debt Securities [Member]
Available-for-sale securities
Assets measured at fair value		23,764	33,778
Commercial Mortgage Backed Securities [Member]
Available-for-sale securities
Assets measured at fair value		14,571	12,769
Other Investment Securities [Member]
Available-for-sale securities
Assets measured at fair value	[1]	$ 18,992	15,299
Interest Rate Swap [Member]
Available-for-sale securities
Liabilities measured at fair value			$ 2,369
Fair Value, Inputs, Level 1 [Member] | Other Investment Securities [Member]
Available-for-sale securities
Assets measured at fair value	[1]
Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Assets measured at fair value		$ 174,251	$ 159,030
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]
Available-for-sale securities
Assets measured at fair value		3,915	3,943
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities
Assets measured at fair value		61,288	61,104
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Available-for-sale securities
Assets measured at fair value		51,721	32,137
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Available-for-sale securities
Assets measured at fair value		23,764	33,778
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage Backed Securities [Member]
Available-for-sale securities
Assets measured at fair value		14,571	12,769
Fair Value, Inputs, Level 2 [Member] | Other Investment Securities [Member]
Available-for-sale securities
Assets measured at fair value	[1]	$ 18,992	15,299
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Available-for-sale securities
Liabilities measured at fair value			$ 2,369
Fair Value, Inputs, Level 3 [Member] | Other Investment Securities [Member]
Available-for-sale securities
Assets measured at fair value	[1]

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