Note 13 - Junior Subordinated Debentures (Details) - Trusts - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Note 13 - Junior Subordinated Debentures (Details) - Trusts [Line Items]
Bank of Commerce Holdings Trust II		$ 10,310	$ 10,310
Bank of Commerce Holdings Trust II [Member] | Junior Subordinated Debt [Member]
Note 13 - Junior Subordinated Debentures (Details) - Trusts [Line Items]
Bank of Commerce Holdings Trust II		Jul. 29, 2005
Bank of Commerce Holdings Trust II		$ 10,310
Bank of Commerce Holdings Trust II	[1]	Sep. 15, 2035
Bank of Commerce Holdings Trust II	[2],[3]

[1] Effective rate as of December 31, 2015 and 2014 of 1.92% and 1.81% respectively.

[2] Contractual interest rate of junior subordinated debentures.

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