Note 13 - Junior Subordinated Debentures (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013
Note 13 - Junior Subordinated Debentures (Details) [Line Items]
Number of Wholy Owned Trusts		1	1
Junior Subordinated Notes		$ 10,310	$ 10,310
Repayments of Subordinated Debt			4,629
Gains (Losses) on Extinguishment of Debt			406
Reduction In Common Stock Held In Trust			$ 155
Bank of Commerce Holdings Trust II [Member]
Note 13 - Junior Subordinated Debentures (Details) [Line Items]
Common Stock Held in Trust		$ 310
Junior Subordinated Debt [Member]
Note 13 - Junior Subordinated Debentures (Details) [Line Items]
Number of Wholy Owned Trusts		1		2
Junior Subordinated Debt [Member] | Bank of Commerce Holdings Trust II [Member]
Note 13 - Junior Subordinated Debentures (Details) [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		1.92%	1.81%
Debt Instrument, Basis Spread on Variable Rate	[1],[2]
Junior Subordinated Notes		$ 10,310
Junior Subordinated Debt [Member] | Bank of Commerce Holdings Trust II [Member] | London Interbank Offered Rate (LIBOR) [Member]
Note 13 - Junior Subordinated Debentures (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.58%
Junior Subordinated Debt [Member] | Bank Of Commerce Holdings Trust [Member]
Note 13 - Junior Subordinated Debentures (Details) [Line Items]
Debt Instrument, Increase (Decrease), Net			$ (5,200)
Repayments of Subordinated Debt			4,600
Gains (Losses) on Extinguishment of Debt			$ 406

[1] Contractual interest rate of junior subordinated debentures.

[2] Rate based on three month LIBOR plus 1.58% adjusted quarterly.