Note 2 - Summary of Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]
Number of Wholy Owned Trusts	1	1
Repayments of Subordinated Debt (in Dollars)		$ 4,629
Gains (Losses) on Extinguishment of Debt (in Dollars)		406
Reduction In Common Stock Held In Trust (in Dollars)		155
MinimumRiskRatingRangeForLoanAndLeaseLosses	1
MaximumRiskRatingRangeForLoanAndLeaseLosses	8
PercentageOfPortfolioSecuredByRealEstate	74.00%
Recognize Tax Benefit in Percentage	50.00%
Incentive Plan Granted	100.00%
Share Based Compensation Share Based Awards Non-Qualified Stock Options Exercise Price as Percent of Grant Date Fair Value Minimum	85.00%
Share Based Compensation Share Based Awards Non-Qualified Stock Options Term Maximum	10 years
Share Based Compensation Share Based Awards Non-Qualified Stock Options Exercise Period	5 years
Advertising Expense (in Dollars)	$ 64	90	$ 110
Junior Subordinated Debt [Member]
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]
Number of Wholy Owned Trusts	1		2
Junior Subordinated Debt [Member] | Bank Of Commerce Holdings Trust [Member]
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]
Debt Instrument, Increase (Decrease), Net (in Dollars)		(5,200)
Repayments of Subordinated Debt (in Dollars)		4,600
Gains (Losses) on Extinguishment of Debt (in Dollars)		$ 406
Minimum [Member] | Restricted Stock [Member]
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Maximum [Member] | Restricted Stock [Member]
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years