Note 5 - Loans - Non-accrual Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Non-accrual portfolio loans	$ 41,815	$ 48,787	$ 49,682
Non-accrual loans held-for-sale		8,000	7,500
Total non-accrual loans	41,815	56,787	57,182
Contractual interest due	3,166	3,302	3,462
Nonaccrual Loans [Member]
Contractual interest due	1,618	3,254	1,573
Interest recognized	66	86	95
Net interest foregone	$ 1,552	$ 3,168	$ 1,478