Note 10 - Other Assets - Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Qualified Zone Academy Bonds	$ 4,740	$ 4,740
Federal Home Loan Bank of San Francisco stock	4,537	4,465
Interest receivable	4,462	4,044
Investments in affordable housing partnerships	3,529	4,217
Prepaid expenses	1,132	772
Loan servicing receivables	643	841
Investment in Bank of Commerce Holdings Trust II	310	310
SBA payments in process	179	50
Other	129	917
Total	$ 19,661	$ 20,356