Note 5 - Loans - Non-accrual Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Non-accrual portfolio loans	$ 49,682	$ 52,130	$ 70,163
Non-accrual loans held-for-sale	7,500	5,944	973
Total non-accrual loans	57,182	58,074	71,136
Contractual interest due	3,462	3,997	5,339
Nonaccrual Loans [Member]
Contractual interest due	1,573	5,732	6,663
Interest recognized	95	119	217
Net interest foregone	$ 1,478	$ 5,613	$ 6,446