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Note 10 - Other Borrowings (Details) (USD $)	1 Months Ended	12 Months Ended
Note 10 - Other Borrowings (Details) (USD $)	Dec. 31, 2006	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 10 - Other Borrowings (Details) [Line Items]
Annual Paydown of Principal Required		20.00%mbcn_AnnualPaydownOfPrincipalRequired
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds		$ 87,900,000
Stock Issued During Period, Value, New Issues	248,000		74,000	2,329,000
Notes Payable	8,248,000us-gaap_NotesPayable
Mandatorily Redeemable Securities [Member] \| Special Purpose Entity [Member]
Note 10 - Other Borrowings (Details) [Line Items]
Securities Sold under Agreements to Repurchase	$ 8,000,000
London Interbank Offered Rate (LIBOR) [Member]
Note 10 - Other Borrowings (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.67%

Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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- Definition

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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