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Note 5 - Fair Value Measurements (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Estimated Selling Costs of Impaired Loans | $ 2.0 | $ 2.1

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