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Note 9 - Stock Split Disclosure (Tables) | 6 Months Ended
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Jun. 30, 2020
Notes Tables |
Effect of Stock Split [Table Text Block] |
|  | For the three months ended |  |  | For the six months ended |
|  | June 30, 2019 |  |  | June 30, 2019 |
Restated net income per common share - basic |  | $ | 0.51 |  |  | $ | 0.97 |
Restated net income per common share - diluted |  | $ | 0.50 |  |  | $ | 0.97 |
Restated weighted-average common shares issued |  |  | 7,286,542 |  |  |  | 7,278,620 |
Restated average treasury stock shares |  |  | 784,034 |  |  |  | 778,214 |
Restated average shares outstanding - basic |  |  | 6,502,508 |  |  |  | 6,500,406 |
Restated stock options and restricted stock |  |  | 12,438 |  |  |  | 12,644 |
Restated average shares outstanding - diluted |  |  | 6,514,946 |  |  |  | 6,513,050 |
Restated period ending shares outstanding |  |  | 6,485,170 |  |  |  | 6,485,170 |
Restated treasury shares outstanding |  |  | 807,824 |  |  |  | 807,824 |

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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