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Note 9 - Stock Split Disclosure (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Effect of Stock Split [Table Text Block] |
|  | For the three months ended |  |  | For the nine months ended |
|  | September 30, 2019 |  |  | September 30, 2019 |
Restated net income per common share - basic |  | $ | 0.51 |  |  | $ | 1.48 |
Restated net income per common share - diluted |  | $ | 0.50 |  |  | $ | 1.47 |
Restated weighted-average common shares issued |  |  | 7,294,014 |  |  |  | 7,283,808 |
Restated average treasury stock shares |  |  | 835,756 |  |  |  | 797,606 |
Restated average shares outstanding - basic |  |  | 6,458,258 |  |  |  | 6,486,202 |
Restated stock options and restricted stock |  |  | 20,808 |  |  |  | 20,636 |
Restated average shares outstanding - diluted |  |  | 6,479,066 |  |  |  | 6,506,838 |
Restated period ending shares outstanding |  |  | 6,423,130 |  |  |  | 6,423,130 |
Restated treasury shares outstanding |  |  | 871,162 |  |  |  | 871,162 |

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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration