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Note 2 - Revenue Recognition (Details Textual)	9 Months Ended
	Sep. 30, 2019
Revenue from Interest Income and Noninterest Income, Percent	92.20%

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- Definition

Represents the percentage of revenue from interest income and noninterest income.

+ References

No definition available.

+ Details

Name:	mbcn_RevenueFromInterestIncomeAndNoninterestIncomePercent
Namespace Prefix:	mbcn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration