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Note 5 - Fair Value Measurements - Estimated Fair Value of the Company's Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Reported Value Measurement [Member] |  |
Financial assets: |  |
Cash and cash equivalents | $ 132,351 | $ 112,417
Loans held for sale | 676 | 878
Net loans | 996,048 | 1,090,626
Bank-owned life insurance | 16,954 | 16,938
Federal Home Loan Bank stock | 4,399 | 5,057
Accrued interest receivable | 4,392 | 5,210
Financial liabilities: |  |
Deposits | 1,200,557 | 1,225,200
Other borrowings | 12,966 | 17,038
Accrued interest payable | 305 | 580
Estimate of Fair Value Measurement [Member] |  |
Financial assets: |  |
Cash and cash equivalents | 132,351 | 112,417
Loans held for sale | 1,105 | 878
Net loans | 986,527 | 1,089,573
Bank-owned life insurance | 16,954 | 16,938
Federal Home Loan Bank stock | 4,399 | 5,057
Accrued interest receivable | 4,392 | 5,210
Financial liabilities: |  |
Deposits | 1,202,362 | 1,229,101
Other borrowings | 12,966 | 15,250
Accrued interest payable | 305 | 580
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Financial assets: |  |
Cash and cash equivalents | 132,351 | 112,417
Loans held for sale | 0 | 0
Net loans | 0 | 0
Bank-owned life insurance | 16,954 | 16,938
Federal Home Loan Bank stock | 4,399 | 5,057
Accrued interest receivable | 4,392 | 5,210
Financial liabilities: |  |
Deposits | 988,883 | 929,450
Other borrowings | 0 | 0
Accrued interest payable | 305 | 580
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial assets: |  |
Cash and cash equivalents | 0 | 0
Loans held for sale | 1,105 | 878
Net loans | 0 | 0
Bank-owned life insurance | 0 | 0
Federal Home Loan Bank stock | 0 | 0
Accrued interest receivable | 0 | 0
Financial liabilities: |  |
Deposits | 0 | 0
Other borrowings | 0 | 0
Accrued interest payable | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Financial assets: |  |
Cash and cash equivalents | 0 | 0
Loans held for sale | 0 | 0
Net loans | 986,527 | 1,089,573
Bank-owned life insurance | 0 | 0
Federal Home Loan Bank stock | 0 | 0
Accrued interest receivable | 0 | 0
Financial liabilities: |  |
Deposits | 213,479 | 299,651
Other borrowings | 12,966 | 15,250
Accrued interest payable | $ 0 | $ 0

X
- Definition Fair value portion of accrued interest payable. + References No definition available. + Details
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Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fair value portion of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy. + References No definition available. + Details
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Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The fair value portion as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + References No definition available. + Details
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Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
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X
- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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X
- Definition Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock. + References No definition available. + Details
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X
- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of other liabilities. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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