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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

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