Note 6 - Debt and Equity Securities (Details) - Credit Loss Component Recognized in Earnings on Debt Securities for Which a Portion of OTTI Was Recognized in AOCI (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Credit Loss Component Recognized in Earnings on Debt Securities for Which a Portion of OTTI Was Recognized in AOCI [Abstract]
Balance	$ 3,738	$ 6,178	$ 6,922
Recognition of actual losses		(842)	(1,271)
OTTI charges due to credit loss recorded in earnings		1,419	776
Securities sold during the period	(3,738)	(3,017)	(249)
Balance		$ 3,738	$ 6,178