Note 5 - Securities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Note 5 - Securities (Details) [Line Items]
Number of Temporarily Impaired Securities	154
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	$ 141,138
Unrealized Loss on Securities	2,098
Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value	105,032	178,042
Continuous Unrealized Loss Position, 12 Months Or Longer, Aggregate Losses	$ 1,826	$ 5,490
Contingent Convertible Preferred Stock [Member]
Note 5 - Securities (Details) [Line Items]
Number of Temporarily Impaired Securities	112