Note 7 - Fair Value of Financial Instruments (Details) - Asstets Measured on a Recurring Basis Using Significant Unobservable Inputs - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Impairment charges on Level 3	$ 0	$ 21	$ (13)	$ 21
Fair Value, Inputs, Level 3 [Member] | Collateralized Debt Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance,	3,042	2,807	3,193	2,850
Balance,	2,006	2,977	2,006	2,977
Unrealized gains (losses)	578	177	449	134
Paydowns			(19)
Proceeds from sales	(1,538)		(1,538)
Realized losses	(76)		(76)
Impairment charges on Level 3		(7)	(3)	(7)
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance,	3,006	3,006	3,005	3,006
Balance,	2,684	$ 3,006	2,684	$ 3,006
Unrealized gains (losses)	$ (322)		$ (321)