Note 15 - Fair Values (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Available-for-sale securities
Assets measured at fair value	$ 189,379		$ 216,640
Liabilities measured at fair value	3,123		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	7,825		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	7,825		6,264
Obligations of States and Political Subdivisions [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Assets measured at fair value	57,161		59,209
Obligations of States and Political Subdivisions [Member]
Available-for-sale securities
Assets measured at fair value	57,161		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	46,498		62,991
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]
Available-for-sale securities
Assets measured at fair value	46,498		62,991
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Assets measured at fair value	39,717		48,230
Corporate Debt Securities [Member]
Available-for-sale securities
Assets measured at fair value	39,717		48,230
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Assets measured at fair value	11,100		10,472
Commercial Mortgage Backed Securities [Member]
Available-for-sale securities
Assets measured at fair value	11,100		10,472
Other Investment Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities
Assets measured at fair value		[1]		[1]
Other Investment Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Assets measured at fair value	27,078	[1]	29,474	[1]
Other Investment Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities
Assets measured at fair value		[1]		[1]
Other Investment Securities [Member]
Available-for-sale securities
Assets measured at fair value	27,078	[1]	29,474	[1]
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]
Available-for-sale securities
Liabilities measured at fair value	0		0
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] | Interest Rate Swap [Member]
Available-for-sale securities
Liabilities measured at fair value	3,123		2,890
Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities
Assets measured at fair value	189,379		216,640
Liabilities measured at fair value	3,123		2,890
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
Available-for-sale securities
Liabilities measured at fair value	0		0
Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities
Assets measured at fair value	0		0
Liabilities measured at fair value	0		0
Interest Rate Swap [Member]
Available-for-sale securities
Liabilities measured at fair value	$ 3,123		$ 2,890

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