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Note 9 - Short-term Borrowings (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 9 - Short-term Borrowings (Details) [Line Items]      
Long-term Line of Credit $ 3.1us-gaap_LineOfCredit $ 3.9us-gaap_LineOfCredit $ 4.9us-gaap_LineOfCredit
Lorain National Bank [Member]      
Note 9 - Short-term Borrowings (Details) [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity 4.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= mbcn_LorainNationalBankMember
   
Line of Credit Facility, Interest Rate During Period 3.66%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_CreditFacilityAxis
= mbcn_LorainNationalBankMember
   
Liberty Bank NA [Member]      
Note 9 - Short-term Borrowings (Details) [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 3.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= mbcn_LibertyBankNAMember
   
Line of Credit Facility, Interest Rate During Period 4.00%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_CreditFacilityAxis
= mbcn_LibertyBankNAMember