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Note 16 - Regulatory Restrictions (Details Textual) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Reserves Required by Federal Reserve Bank | $ 15.8 | $ 2.9
Percent of Common Stock | 10.00% |
Amount Available for Payment of Dividends | $ 5.1 |

X
- Definition Amount available for payment of dividends. + References No definition available. + Details
Name: | mbcn_AmountAvailableForPaymentOfDividends
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percent of common stock. + References No definition available. + Details
Name: | mbcn_PercentOfCommonStock
Namespace Prefix: | mbcn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Reserves required by Federal Reserve Bank. + References No definition available. + Details
Name: | mbcn_ReservesRequiredByFederalReserveBank
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant