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Note 16 - Regulatory Capital (Details) - Capital Ratios (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Feb. 28, 2011
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
To Be Well Capitalized 10.00% 10.00%  
To Be Well Capitalized 6.00% 6.00%  
To Be Well Capitalized 5.00% 5.00%  
Middlefield Banc Corp [Member]
      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Actual (in Dollars) $ 64,220 $ 57,784  
Actual 14.06% 13.86%  
For Capital Adequacy Purposes (in Dollars) 36,541 33,344  
For Capital Adequacy Purposes 8.00% 8.00%  
To Be Well Capitalized (in Dollars) 45,676 41,680  
To Be Well Capitalized 10.00% 10.00%  
Actual (in Dollars) 58,494 52,543  
Actual 12.81% 12.61%  
For Capital Adequacy Purposes (in Dollars) 18,270 16,672  
For Capital Adequacy Purposes 4.00% 4.00%  
To Be Well Capitalized (in Dollars) 27,406 25,008  
To Be Well Capitalized 6.00% 6.00%  
Actual (in Dollars) 58,494 52,543  
Actual 8.97% 7.88%  
For Capital Adequacy Purposes (in Dollars) 26,093 26,675  
For Capital Adequacy Purposes 4.00% 4.00%  
To Be Well Capitalized (in Dollars) 32,617 33,344  
To Be Well Capitalized 5.00% 5.00%  
Middlefield Banking Company [Member]
      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Actual (in Dollars) 53,194 47,887  
Actual 13.77% 13.29%  
For Capital Adequacy Purposes (in Dollars) 30,906 28,822  
For Capital Adequacy Purposes 8.00% 8.00%  
To Be Well Capitalized (in Dollars) 38,632 36,027  
To Be Well Capitalized 10.00% 10.00%  
Actual (in Dollars) 48,364 43,371  
Actual 12.52% 12.04%  
For Capital Adequacy Purposes (in Dollars) 15,453 14,411  
For Capital Adequacy Purposes 4.00% 4.00%  
To Be Well Capitalized (in Dollars) 23,179 21,616  
To Be Well Capitalized 6.00% 6.00%  
Actual (in Dollars) 48,364 43,371  
Actual 8.51% 7.32%  
For Capital Adequacy Purposes (in Dollars) 22,735 23,684  
For Capital Adequacy Purposes 4.00% 4.00%  
To Be Well Capitalized (in Dollars) 28,419 29,605  
To Be Well Capitalized 5.00% 5.00%  
Emerald Bank [Member]
      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Actual (in Dollars) 9,482 8,440  
Actual 13.76% 15.45%  
For Capital Adequacy Purposes (in Dollars) 5,514 4,370  
For Capital Adequacy Purposes 8.00% 8.00%  
To Be Well Capitalized (in Dollars) 6,893 5,463  
To Be Well Capitalized 10.00% 10.00%  
Actual (in Dollars) 8,605 7,737  
Actual 12.48% 14.16%  
For Capital Adequacy Purposes (in Dollars) 2,757 2,185  
For Capital Adequacy Purposes 4.00% 4.00%  
To Be Well Capitalized (in Dollars) 4,136 3,278  
To Be Well Capitalized 6.00% 6.00%  
Actual (in Dollars) 8,605 7,737  
Actual 10.92% 10.61%  
For Capital Adequacy Purposes (in Dollars) 3,152 2,916  
For Capital Adequacy Purposes 4.00% 4.00% 9.00%
To Be Well Capitalized (in Dollars) $ 3,940 $ 3,646  
To Be Well Capitalized 5.00% 5.00%