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Note 16 - Regulatory Capital (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure Text Block [Abstract]

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

		Middlefield Banc Corp.								The Middlefield Banking Co.								Emerald Bank
(Dollar amounts in thousands)		December 31, 2013								December 31, 2013								December 31, 2013
		Amount				Ratio				Amount				Ratio				Amount				Ratio

Total Capital (to Risk-weighted Assets)

Actual		$	64,220				14.06	%		$	53,194				13.77	%		$	9,482				13.76	%
For Capital Adequacy Purposes			36,541				8.00				30,906				8.00				5,514				8.00
To Be Well Capitalized			45,676				10.00				38,632				10.00				6,893				10.00

Tier I Capital (to Risk-weighted Assets)

Actual		$	58,494				12.81	%		$	48,364				12.52	%		$	8,605				12.48	%
For Capital Adequacy Purposes			18,270				4.00				15,453				4.00				2,757				4.00
To Be Well Capitalized			27,406				6.00				23,179				6.00				4,136				6.00

Tier I Capital (to Average Assets)

Actual		$	58,494				8.97	%		$	48,364				8.51	%		$	8,605				10.92	%
For Capital Adequacy Purposes			26,093				4.00				22,735				4.00				3,152				4.00
To Be Well Capitalized			32,617				5.00				28,419				5.00				3,940				5.00

		Middlefield Banc Corp.								The Middlefield Banking Co.								Emerald Bank
		December 31, 2012								December 31, 2012								December 31, 2012
		Amount				Ratio				Amount				Ratio				Amount				Ratio

Total Capital (to Risk-weighted Assets)

Actual		$	57,784				13.86	%		$	47,887				13.29	%		$	8,440				15.45	%
For Capital Adequacy Purposes			33,344				8.00				28,822				8.00				4,370				8.00
To Be Well Capitalized			41,680				10.00				36,027				10.00				5,463				10.00

Tier I Capital (to Risk-weighted Assets)

Actual		$	52,543				12.61	%		$	43,371				12.04	%		$	7,737				14.16	%
For Capital Adequacy Purposes			16,672				4.00				14,411				4.00				2,185				4.00
To Be Well Capitalized			25,008				6.00				21,616				6.00				3,278				6.00

Tier I Capital (to Average Assets)

Actual		$	52,543				7.88	%		$	43,371				7.32	%		$	7,737				10.61	%
For Capital Adequacy Purposes			26,675				4.00				23,684				4.00				2,916				4.00
To Be Well Capitalized			33,344				5.00				29,605				5.00				3,646				5.00

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.

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