Note 4 - Fair Value (Details) - Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total unrealized gains/(losses) included in other comprehensive income	$ 742	$ (105)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of year	19,450	21,870
Total realized and unrealized gains/(losses) included in income	0	0
Total unrealized gains/(losses) included in other comprehensive income	0	0
Purchases of securities	325	165
Sales of securities	0	0
Calls and maturities	(1,108)	0
Net transfers into Level 3	0	0
Balance at March 31 of each year	$ 18,667	$ 22,035