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Note 9 - Business Acquisition - Purchase Price and Adjustments (Details) - USD ($)
Jan. 12, 2017
Mar. 31, 2017
Dec. 31, 2016
Net assets acquired:      
Goodwill   $ 15,646,000 $ 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)    
Net assets acquired:      
Liberty Bank shareholders equity 30,097,000    
Allowance for loan loss 3,257,000    
Core deposit intangible 3,087    
Loans - interest rate 578,000    
Loans - general credit (2,161,000)    
Deferred tax asset (1,104,000)    
Other 254,000    
Time deposits (141,000)    
Change in control (1,718,000)    
32,149,000    
Goodwill $ 11,087,000