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Note 9 - Stock Split Disclosure (Tables) | 3 Months Ended
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Mar. 31, 2020
Notes Tables |
Effect of Stock Split [Table Text Block] |
|  | For the three months ended |
|  | March 31, 2019 |
Restated net income per common share - basic |  | $ | 0.46 |
Restated net income per common share - diluted |  | $ | 0.46 |
Restated weighted-average common shares issued |  |  | 7,270,608 |
Restated average treasury stock shares |  |  | 772,330 |
Restated average shares outstanding - basic |  |  | 6,498,278 |
Restated stock options and restricted stock |  |  | 12,290 |
Restated average shares outstanding - diluted |  |  | 6,510,568 |
Restated period ending shares outstanding |  |  | 6,512,740 |
Restated treasury shares outstanding |  |  | 772,330 |

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- Definition The tabular disclosure for the effect of the stock split. + References No definition available. + Details
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Namespace Prefix: | mbcn_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration