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Note 16 - Regulatory Capital (Tables) | 12 Months Ended
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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 |

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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 1G -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958577-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 18 -IssueDate 2006-05-01 -Chapter 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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=7881181&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 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 Reference 5: 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=7881181&loc=SL5958570-112826 + Details
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