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Note 17 - Regulatory Capital (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure Text Block [Abstract]

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

		As of December 31, 2015
		Leverage				Tier 1 Risk  Based				Common Equity Tier 1				Total Risk  Based
The Middlefield Banking Company			9.23	%			12.52	%			12.52	%			13.73	%
Middlefield Banc Corp.			8.69	%			12.00	%			12.00	%			13.20	%
Adequately capitalized ratio			4.00	%			6.00	%			4.50	%			8.00	%
Adequately capitalized ratio plus 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, 2014
		Leverage				Tier 1 Risk Based				Total Risk Based
The Middlefield Banking Company			9.25	%			12.95	%			14.19	%
Middlefield Banc Corp.			9.60	%			13.38	%			14.64	%
Adequately capitalized ratio			4.00	%			4.00	%			8.00	%
Well-capitalized ratio (Bank only)			5.00	%			6.00	%			10.00	%

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- References

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- 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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1G
-URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958577-112826

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