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Note 16 - Regulatory Capital (Tables)

12 Months Ended

Dec. 31, 2012

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

(Dollar amounts in thousands)		Middlefield Banc Corp. December 31, 2012								The Middlefield Banking Co. December 31, 2012								Emerald Bank 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

		Middlefield Banc Corp. December 31, 2011								The Middlefield Banking Co. December 31, 2011								Emerald Bank December 31, 2011
		Amount				Ratio				Amount				Ratio				Amount				Ratio

Total Capital
(to Risk-weighted Assets)

Actual		$	49,915				12.06	%		$	42,185				11.75	%		$	7,456				13.82	%
For Capital Adequacy Purposes			33,101				8.00				28,722				8.00				4,317				8.00
To Be Well Capitalized			41,376				10.00				35,903				10.00				5,396				10.00

Tier I Capital
(to Risk-weighted Assets)

Actual		$	44,723				10.81	%		$	37,697				10.50	%		$	6,782				12.57	%
For Capital Adequacy Purposes			16,551				4.00				14,361				4.00				2,158				4.00
To Be Well Capitalized			24,826				6.00				21,542				6.00				3,237				6.00

Tier I Capital
(to Average Assets)

Actual		$	44,723				7.13	%		$	37,697				6.75	%		$	6,782				9.92	%
For Capital Adequacy Purposes			25,079				4.00				22,325				4.00				2,734				4.00
To Be Well Capitalized			31,349				5.00				27,906				5.00				3,417				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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