Note 5 - Securities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Note 5 - Securities (Details) [Line Items]
Number of Temporarily Impaired Securities	245
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	$ 212,176
Unrealized Loss on Securities	10,937
Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value	98,516	$ 178,042
Continuous Unrealized Loss Position, 12 Months Or Longer, Aggregate Losses	$ 6,593	$ 5,490
Contingent Convertible Preferred Stock [Member]
Note 5 - Securities (Details) [Line Items]
Number of Temporarily Impaired Securities	111