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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)

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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