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Note 2 - Revenue Recognition (Details Textual) | 12 Months Ended
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Dec. 31, 2018
Revenue from Interest Income and Noninterest Income, Percent | 92.80%

X
- 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