Note 12 - Fair Values (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis - USD ($)		Jun. 30, 2015	Dec. 31, 2014
Available for sale securities
Available for sale securities	[1]	$ 373,446,000	$ 432,912,000
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Derivative		(379,000)	(253,000)
Assets and liabilities measured at fair value on recurring basis		373,067,000	432,659,000
US Government Agencies Debt Securities [Member]
Available for sale securities
Available for sale securities		161,708,000	193,468,000
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		161,708,000	193,468,000
Collateralized Mortgage Backed Securities [Member]
Available for sale securities
Available for sale securities		79,841,000	93,561,000
Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		79,841,000	93,561,000
Municipal General Obligation Bonds [Member]
Available for sale securities
Available for sale securities		119,811,000	133,082,000
Municipal General Obligation Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		119,811,000	133,082,000
Municipal Revenue Bonds [Member]
Available for sale securities
Available for sale securities		10,149,000	10,873,000
Municipal Revenue Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		10,149,000	10,873,000
Other Debt Obligations [Member]
Available for sale securities
Available for sale securities		1,937,000	1,928,000
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		1,937,000	1,928,000
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Derivative		0	0
Assets and liabilities measured at fair value on recurring basis		0	0
Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		0	0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		0	0
Fair Value, Inputs, Level 1 [Member] | Municipal General Obligation Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		0	0
Fair Value, Inputs, Level 1 [Member] | Municipal Revenue Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		0	0
Fair Value, Inputs, Level 1 [Member] | Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		0	0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Derivative		(379,000)	(253,000)
Assets and liabilities measured at fair value on recurring basis		364,278,000	422,378,000
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		161,708,000	193,468,000
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		79,841,000	93,561,000
Fair Value, Inputs, Level 2 [Member] | Municipal General Obligation Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		111,022,000	122,801,000
Fair Value, Inputs, Level 2 [Member] | Municipal Revenue Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		10,149,000	10,873,000
Fair Value, Inputs, Level 2 [Member] | Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		1,937,000	1,928,000
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Derivative		0	0
Assets and liabilities measured at fair value on recurring basis		8,789,000	10,281,000
Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		0	0
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		0	0
Fair Value, Inputs, Level 3 [Member] | Municipal General Obligation Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		8,789,000	10,281,000
Fair Value, Inputs, Level 3 [Member] | Municipal Revenue Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		0	0
Fair Value, Inputs, Level 3 [Member] | Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Available for sale securities
Available for sale securities		$ 0	$ 0

[1] See Note 12 for a description of the fair value hierarchy as well as a disclosure of levels for classes of financial assets and liabilities.