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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, 2018
Previously held equity interest in Liberty   $ 1,068,000  
Goodwill, Ending Balance   15,071,000 $ 15,071,000
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    
Purchase price assigned to Liberty common shares exchanged for cash 21,173,000    
Business Combination, Consideration Transferred, Total 42,168,000    
Previously held equity interest in Liberty 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, Ending Balance $ 10,512,000 $ 10,500,000