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Note 5 - Fair Value Measurements - Assets Measured on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Premises and equipment held for sale	$ 998
Collateral-dependent loans	6,007	$ 3,321
Fair Value, Inputs, Level 1 [Member]
Premises and equipment held for sale	0
Collateral-dependent loans	0	0
Fair Value, Inputs, Level 2 [Member]
Premises and equipment held for sale	0
Collateral-dependent loans	0	0
Fair Value, Inputs, Level 3 [Member]
Premises and equipment held for sale	998
Collateral-dependent loans	$ 6,007	$ 3,321

X

- Definition

Fair value of impaired loans receivable.

+ 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 of the property plant and equipment held for sale.

+ References

No definition available.

+ Details

Name:	mbcn_PropertyPlantAndEquipmentHeldForSaleFairValue
Namespace Prefix:	mbcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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Balance Type:
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- Details

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X

- Details

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- Details

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