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Note 5 - Fair Value Measurements (Details Textual) | 3 Months Ended
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Mar. 31, 2018 USD ($)
Estimated Selling Costs of Impaired Loans | $ 573,000

X
- Definition The estimated amount of selling costs that would incur when impaired loans sold. + References No definition available. + Details
Name: | mbcn_EstimatedSellingCostsOfImpairedLoans
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration