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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