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Note 19 - Parent Company (Details) - Condensed Statement of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
OPERATING ACTIVITIES        
Net income $ 7,028,000 $ 6,281,000 $ 4,130,000 $ 4,130,000
Adjustments to reconcile net income to net cash provided by operating activities:        
Stock-based compensation expense   32,000 59,000  
Investment securities losses, net 11,000 610,000 (173,000)  
Other 364,000 355,000 (22,000)  
Net cash provided by operating activities 9,897,000 10,282,000 9,146,000  
INVESTING ACTIVITIES        
Net cash used for investing activities (6,097,000) (8,005,000) (19,360,000)  
FINANCING ACTIVITIES        
Net decrease in short-term borrowings 4,271,000 (854,000) (240,000)  
Common stock issued 74,000 2,329,000 2,210,000  
Cash dividends (2,097,000) (2,002,000) (1,764,000)  
Net cash (used for) provided by financing activities (22,953,000) 8,679,000 13,969,000  
(Decrease) increase in cash (19,153,000) 10,956,000 3,755,000  
Cash and Cash Equivalents 26,193,000 45,346,000 34,390,000 30,635,000
Parent Company [Member] | Middlefield Banking Company [Member]
        
Adjustments to reconcile net income to net cash provided by operating activities:        
Equity in undistributed net income (4,884,000) (4,655,000) (3,422,000)  
Parent Company [Member] | Emerald Bank [Member]
        
Adjustments to reconcile net income to net cash provided by operating activities:        
Equity in undistributed net income (598,000) (240,000) 384,000  
Parent Company [Member] | EMORECO [Member]
        
Adjustments to reconcile net income to net cash provided by operating activities:        
Equity in undistributed net income 104,000 280,000 441,000  
Parent Company [Member]
        
OPERATING ACTIVITIES        
Net income 7,028,000 6,281,000 4,130,000  
Adjustments to reconcile net income to net cash provided by operating activities:        
Equity in undistributed net income 5,378,000 4,615,000 2,597,000  
Stock-based compensation expense   32,000 59,000  
Investment securities losses, net     179,000  
Other (253,000) (885,000) (806,000)  
Net cash provided by operating activities 1,397,000 813,000 965,000  
FINANCING ACTIVITIES        
Net decrease in short-term borrowings (976,000) (804,000)    
Common stock issued 74,000 2,329,000 2,210,000  
Stock options exercised (77,000)      
Proceeds from dividend reinvestment plan 736,000 694,000 542,000  
Cash dividends (2,097,000) (2,002,000) (1,764,000)  
Net cash (used for) provided by financing activities (2,340,000) 217,000 988,000  
(Decrease) increase in cash (943,000) 1,030,000 453,000  
Parent Company [Member] | Beginning of Period [Member]
        
FINANCING ACTIVITIES        
Cash and Cash Equivalents 1,740,000 710,000 257,000  
Parent Company [Member] | End of Period [Member]
        
FINANCING ACTIVITIES        
Cash and Cash Equivalents 797,000 1,740,000 710,000  
Non-Bank Subsidiaries [Member] | Parent Company [Member]
        
INVESTING ACTIVITIES        
Investment in subsidiary bank     (1,500,000)  
Net cash used for investing activities     $ (1,500,000)