Note 11 - Commitments and Contingencies - Summary of the Bank's Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Commitments	$ 217,836	$ 229,387
Standby Letters of Credit [Member]
Commitments	2,106	1,967
Federal Home Loan Bank of San Francisco Affordable Housing Grant Sponsorships [Member]
Commitments	3,338	3,338
Commitments to Extend Credit [Member]
Commitments	$ 212,392	$ 224,082