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Note 20 - Parent Company (Details) - Condensed Statement of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
OPERATING ACTIVITIES                      
Net income $ 1,750 $ 1,982 $ 1,505 $ 1,628 $ 1,888 $ 1,918 $ 1,611 $ 1,763 $ 6,865 $ 7,180 $ 7,028
Other                 121 (831) 263
Net cash provided by operating activities                 7,182 7,459 9,897
FINANCING ACTIVITIES                      
Net increase (decrease) in short-term borrowings                 21,017 3,999 4,271
Purchase of treasury stock                 (6,784)    
Common stock issued                     74
Cash dividends                 2,153 2,121 2,097
Net cash used for financing activities                 50,374 18,709 (22,953)
Increase (decrease) in cash                 (1,889) (554) (19,153)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR       25,639       26,193 25,639 26,193 45,346
CASH AND CASH EQUIVALENTS AT END OF YEAR 23,750       25,639       23,750 25,639 26,193
Parent Company [Member]                      
OPERATING ACTIVITIES                      
Net income                 6,865 7,180 7,028
Equity method investments, income (loss)                 (3,587) (4,772) (5,378)
Net cash provided by operating activities                 2,793 2,009 1,397
FINANCING ACTIVITIES                      
Net increase (decrease) in short-term borrowings                 6,363 (759) (976)
Purchase of treasury stock                 (6,784)    
Common stock issued                     74
Stock options exercised                 (7) (50) (77)
Proceeds from dividend reinvestment plan                 651 590 736
Cash dividends                 (2,153) (2,121) (2,097)
Net cash used for financing activities                 (1,930) (2,340) (2,340)
Increase (decrease) in cash                 863 (331) (943)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR       $ 466       $ 797 466 797 1,740
CASH AND CASH EQUIVALENTS AT END OF YEAR $ 1,329       $ 466       1,329 466 797
Parent Company [Member] | Middlefield Banking Company [Member]                      
OPERATING ACTIVITIES                      
Equity method investments, income (loss)                 (3,703) (4,798) (4,884)
Stock-based compensation expense                 18 10  
Other                 (503) (409) (253)
Parent Company [Member] | Emerald Bank [Member]                      
OPERATING ACTIVITIES                      
Equity method investments, income (loss)                     (598)
Parent Company [Member] | EMORECO [Member]                      
OPERATING ACTIVITIES                      
Equity method investments, income (loss)                 $ 116 $ 26 $ 104