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Note 17 - Regulatory Capital (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

		As of December 31, 2024
		Leverage				Tier 1 Risk Based				Common Equity Tier 1				Total Risk Based
The Middlefield Banking Company			10.70	%			11.99	%			11.99	%			13.24	%
Middlefield Banc Corp.			10.86	%			12.28	%			11.78	%			13.54	%
Adequately capitalized ratio			4.00	%			6.00	%			4.50	%			8.00	%
Adequately capitalized ratio plus fully phased-in capital conservation buffer			4.00	%			8.50	%			7.00	%			10.50	%
Well-capitalized ratio (Bank only)			5.00	%			8.00	%			6.50	%			10.00	%

		As of December 31, 2023
		Leverage				Tier 1 Risk Based				Common Equity Tier 1				Total Risk Based
The Middlefield Banking Company			10.48	%			11.82	%			11.82	%			13.08	%
Middlefield Banc Corp.			10.68	%			12.18	%			11.66	%			13.43	%
Adequately capitalized ratio			4.00	%			6.00	%			4.50	%			8.00	%
Adequately capitalized ratio plus fully phased-in capital conservation buffer			4.00	%			8.50	%			7.00	%			10.50	%
Well-capitalized ratio (Bank only)			5.00	%			8.00	%			6.50	%			10.00	%

X

- Definition

Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

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X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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