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Note 19 - Parent Company (Detail) - Condensed Statement of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
OPERATING ACTIVITIES      
Net income $ 6,281,000 $ 4,130,000 $ 2,517,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Stock-based compensation expense 32,000 59,000  
Investment securities losses, net 610,000 (173,000) 11,000
Other 355,000 (22,000) (538,000)
Net cash provided by operating activities 10,282,000 9,146,000 5,734,000
INVESTING ACTIVITIES      
Net cash used for investing activities (8,005,000) (19,360,000) (87,558,000)
FINANCING ACTIVITIES      
Net decrease in short-term borrowings (854,000) (240,000) 832,000
Common stock issued 2,329,000 2,210,000  
Cash dividends (2,002,000) (1,764,000) (1,637,000)
Net cash provided by (used for) financing activities 8,679,000 13,969,000 71,306,000
Increase (decrease) in cash 10,956,000 3,755,000 (10,518,000)
Cash and Cash Equivalents 45,346,000 34,390,000 30,635,000
Non-Bank Subsidiaries [Member] | Parent Company [Member]
      
INVESTING ACTIVITIES      
Investment in subsidiary bank   (1,500,000) (500,000)
Parent Company [Member] | Beginning of Period [Member]
      
FINANCING ACTIVITIES      
Cash and Cash Equivalents 710,000 257,000 1,100,000
Parent Company [Member] | End of Period [Member]
      
FINANCING ACTIVITIES      
Cash and Cash Equivalents 1,740,000 710,000 257,000
Parent Company [Member] | Middlefield Banking Company [Member]
      
Adjustments to reconcile net income to net cash provided by operating activities:      
Equity in undistributed net income (4,655,000) (3,422,000) (2,582,000)
Parent Company [Member] | Emerald Bank [Member]
      
Adjustments to reconcile net income to net cash provided by operating activities:      
Equity in undistributed net income (240,000) 384,000 292,000
Parent Company [Member] | EMORECO [Member]
      
Adjustments to reconcile net income to net cash provided by operating activities:      
Equity in undistributed net income 280,000 441,000 1,159,000
Parent Company [Member]
      
OPERATING ACTIVITIES      
Net income 6,281,000 4,130,000 2,517,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Equity in undistributed net income 4,615,000 2,597,000 1,131,000
Stock-based compensation expense 32,000 59,000  
Investment securities losses, net   179,000  
Other (885,000) (806,000) (602,000)
Net cash provided by operating activities 813,000 965,000 784,000
INVESTING ACTIVITIES      
Net cash used for investing activities   (1,500,000) (500,000)
FINANCING ACTIVITIES      
Net decrease in short-term borrowings (804,000)    
Common stock issued 2,329,000 2,210,000  
Proceeds from dividend reinvestment plan 694,000 542,000 510,000
Cash dividends (2,002,000) (1,764,000) (1,637,000)
Net cash provided by (used for) financing activities 217,000 988,000 (1,127,000)
Increase (decrease) in cash $ 1,030,000 $ 453,000 $ (843,000)