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Note 1 - Summary of Significant Accounting Policies (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]      
Number of Branches 10mbcn_NumberOfBranches    
Restricted Stock or Unit Expense     $ 32,000us-gaap_RestrictedStockExpense
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 11,223us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 21,112us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
$ 50,000mbcn_PaymentsForStockOptionsExercised $ 77,000mbcn_PaymentsForStockOptionsExercised  
Furniture Fixtures and Equipment [Member] | Minimum [Member]      
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Furniture Fixtures and Equipment [Member] | Maximum [Member]      
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 20 years    
Building and Building Improvements [Member] | Minimum [Member]      
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Building and Building Improvements [Member] | Maximum [Member]      
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 40 years    
Restricted Stock [Member]      
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]      
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures 0us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
0us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
1,722us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Core Deposits [Member]      
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]      
Finite-Lived Intangible Asset, Useful Life 10 years