Note 11 - Revenue Recognition - Non-interest Income Segregated by Revenue Streams (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Non-interest income	$ 1,691	$ 1,210
Non-interest income (out-of-scope of Topic 606)	3,254	3,325
Total non-interest income	4,945	4,535
Deposit Account [Member]
Non-interest income	1,612	1,175
Other Non-interest Income From Customers [Member]
Non-interest income	$ 79	$ 35