Note 10 - Other Assets - Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Federal Home Loan Bank of San Francisco stock	$ 5,892	$ 4,537
Qualified Zone Academy Bonds	4,740	4,740
Interest receivable	4,609	4,462
Investments in affordable housing partnerships	3,020	3,529
Prepaid expenses	1,075	1,132
Investment in CRA fund	1,036	1,011
Loan servicing receivables	625	643
SBA payments in process	411	179
Investment in Bank of Commerce Holdings Trust II	310	310
Other	767	129
Total	$ 22,485	$ 20,672