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Note 20 - Business Acquisition - Purchase Price and Adjustments (Details) - USD ($)
12 Months Ended
Jan. 12, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill   $ 15,071,000 $ 4,559,000  
Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member]        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 544,610      
Shares Issued, Price Per Share $ 38.55      
Purchase price assigned to Liberty common shares exchanged for Middlefield Banc Corp. shares $ 20,995,000      
Purchase price assigned to Liberty common shares exchanged for cash 21,173,000      
Business Combination, Consideration Transferred 42,168,000      
Previously held equity interest in Liberty 1,068,000 1,068,000
Liberty shareholders equity 30,474,000      
Allowance for loan loss 3,257,000      
Loans - interest rate 578,000      
Loans - general credit (2,161,000)      
Core deposit intangible 3,087,000      
Other 254,000      
Time deposits (141,000)      
Deferred taxes (906,000)      
Change in control (1,718,000)      
Total net assets acquired 32,724,000      
Goodwill $ 10,512,000 $ 10,500,000