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Note 19 - Parent Company (Details) - Condensed Statement of Cash Flows (USD $) | 12 Months Ended
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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) |

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