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Note 9 - Business Acquisition - Purchase Price and Adjustments (Details) - USD ($)
6 Months Ended
Jan. 12, 2017
Jun. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Net assets acquired:        
Goodwill     $ 15,435,000 $ 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 Bank common shares exchanged for Middlefield Banc Corp. shares $ 20,995,000      
us-gaap_BusinessCombinationConsiderationTransferredIncludingEquityInterestInAcquireeHeldPriorToCombinationAbstract        
Payments to Acquire Businesses, Gross 21,173,000      
Business Combination, Consideration Transferred 42,168,000      
Previously held equity interest in Liberty Bank 1,068,000 $ 1,068,000    
Net assets acquired:        
Liberty Bank shareholders equity 30,277,000      
Allowance for loan loss 3,257,000      
Core deposit intangible 3,087,000      
Loans - interest rate 578,000      
Loans - general credit (2,161,000)      
Deferred tax asset (1,073,000)      
Other 254,000      
Time deposits (141,000)      
Change in control (1,718,000)      
32,360,000      
Goodwill $ 10,876,000