Note 15 - Fair Values - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value		3,262	3,943
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value
US Government Agencies Debt Securities [Member]
Assets measured at fair value		3,262	3,943
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value		59,015	61,104
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value
US States and Political Subdivisions Debt Securities [Member]
Assets measured at fair value		59,015	61,104
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value		45,015	32,137
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value
Residential Mortgage Backed Securities [Member]
Assets measured at fair value		45,015	32,137
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value		22,313	33,778
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value
Corporate Debt Securities [Member]
Assets measured at fair value		22,313	33,778
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value		14,865	12,769
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value
Commercial Mortgage Backed Securities [Member]
Assets measured at fair value		14,865	12,769
Other Investment Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value	[1]
Other Investment Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value	[1]	13,436	15,299
Other Investment Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value	[1]
Other Investment Securities [Member]
Assets measured at fair value	[1]	13,436	15,299
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]
Liabilities measured at fair value
Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Liabilities measured at fair value
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Liabilities measured at fair value			2,369
Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value		157,906	159,030
Liabilities measured at fair value			2,369
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
Liabilities measured at fair value
Fair Value, Inputs, Level 3 [Member]
Assets measured at fair value
Liabilities measured at fair value
Interest Rate Swap [Member]
Liabilities measured at fair value			2,369
Assets measured at fair value		$ 157,906	159,030
Liabilities measured at fair value			$ 2,369

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