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Note 16 - Regulatory Capital (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure Text Block [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | Middlefield Banc Corp. |  |  | The Middlefield Banking Co. |
(Dollar amounts in thousands) |  | December 31, 2014 |  |  | December 31, 2014 |
|  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
Total Capital (to Risk-weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual |  | $ | 70,693 |  |  |  | 14.64 | % |  | $ | 68,325 |  |  |  | 14.19 | %
For Capital Adequacy Purposes |  |  | 38,642 |  |  |  | 8.00 | % |  |  | 38,507 |  |  |  | 8.00 | %
To Be Well Capitalized |  |  | 48,302 |  |  |  | 10.00 | % |  |  | 48,134 |  |  |  | 10.00 | %
Tier I Capital (to Risk-weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual |  | $ | 64,645 |  |  |  | 13.38 | % |  | $ | 62,315 |  |  |  | 12.95 | %
For Capital Adequacy Purposes |  |  | 19,321 |  |  |  | 4.00 | % |  |  | 19,253 |  |  |  | 4.00 | %
To Be Well Capitalized |  |  | 28,981 |  |  |  | 6.00 | % |  |  | 28,880 |  |  |  | 6.00 | %
Tier I Capital (to Average Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual |  | $ | 64,645 |  |  |  | 9.60 | % |  | $ | 62,315 |  |  |  | 9.25 | %
For Capital Adequacy Purposes |  |  | 26,945 |  |  |  | 4.00 | % |  |  | 26,945 |  |  |  | 4.00 | %
To Be Well Capitalized |  |  | 33,682 |  |  |  | 5.00 | % |  |  | 33,682 |  |  |  | 5.00 | %
|  | Middlefield Banc Corp. |  |  | The Middlefield Banking Co. |  |  | Emerald Bank |
|  | 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 | %

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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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 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 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 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 + Details
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