Document and Entity Information |
Dec. 01, 2022 |
|---|---|
| Cover [Abstract] | |
| Entity Registrant Name | MIDDLEFIELD BANC CORP |
| Amendment Flag | false |
| Entity Central Index Key | 0000836147 |
| Current Fiscal Year End Date | --12-31 |
| Document Type | 8-K |
| Document Period End Date | Dec. 01, 2022 |
| Entity Incorporation State Country Code | OH |
| Entity File Number | 001-36613 |
| Entity Tax Identification Number | 34-1585111 |
| Entity Address, Address Line One | 15985 East High Street |
| Entity Address, City or Town | Middlefield |
| Entity Address, State or Province | OH |
| Entity Address, Postal Zip Code | 44062 |
| City Area Code | (440) |
| Local Phone Number | 632-1666 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, no par value |
| Trading Symbol | MBCN |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
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- Definition End date of current fiscal year in the format --MM-DD. No definition available.
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- Definition For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD. No definition available.
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- Definition Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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