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Note 21 - Parent Company - Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net income | $ 2,386 | $ 2,462 | $ 2,507 | $ 2,100 | $ 1,660 | $ 1,343 | $ 1,926 | $ 1,487 | $ 9,455 | $ 6,416 | $ 6,865
Gain on sale of investment securities |  |  |  |  |  |  |  |  | (886) | (303) | (323)
Other, net |  |  |  |  |  |  |  |  | (3,122) | 330 | (388)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 13,920 | 7,801 | 7,182
Net (decrease) increase in short-term borrowings |  |  |  |  |  |  |  |  | 6,348 | 32,534 | 21,017
Purchase of treasury stock |  |  |  |  |  |  |  |  |  |  | (6,784)
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 15,164 | 11,210 |
Cash dividends |  |  |  |  |  |  |  |  | 3,358 | 2,318 | 2,153
Net cash used for financing activities |  |  |  |  |  |  |  |  | 88,722 | 46,924 | 50,374
Increase (decrease) in cash |  |  |  |  |  |  |  |  | 7,391 | 8,745 | (1,889)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |  |  |  | 32,495 |  |  |  | 23,750 | 32,495 | 23,750 | 25,639
CASH AND CASH EQUIVALENTS AT END OF YEAR | 39,886 |  |  |  | 32,495 |  |  |  | 39,886 | 32,495 | 23,750
Common stock issued in business acquisition |  |  |  |  |  |  |  |  | 20,995 |  |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 9,455 | 6,416 | 6,865
Equity method investments, income (loss) |  |  |  |  |  |  |  |  | (340) | (4,653) | (3,587)
Stock-based compensation expense |  |  |  |  |  |  |  |  | 33 | 29 | 18
Gain on sale of investment securities |  |  |  |  |  |  |  |  | (488) |  |
Other, net |  |  |  |  |  |  |  |  | 282 | (484) | (503)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 8,942 | 1,308 | 2,793
Acquisition, net of cash paid |  |  |  |  |  |  |  |  | (22,249) |  |
Net (decrease) increase in short-term borrowings |  |  |  |  |  |  |  |  |  | (9,499) | 6,363
Purchase of treasury stock |  |  |  |  |  |  |  |  |  |  | (6,784)
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 15,164 | 11,210 |
Stock options exercised |  |  |  |  |  |  |  |  | 184 | (6) | (7)
Proceeds from dividend reinvestment plan |  |  |  |  |  |  |  |  | 540 | 519 | 651
Cash dividends |  |  |  |  |  |  |  |  | (3,358) | (2,318) | (2,153)
Net cash used for financing activities |  |  |  |  |  |  |  |  | 12,530 | (94) | (1,930)
Increase (decrease) in cash |  |  |  |  |  |  |  |  | (777) | 1,214 | 863
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |  |  |  | $ 2,543 |  |  |  | $ 1,329 | 2,543 | 1,329 | 466
CASH AND CASH EQUIVALENTS AT END OF YEAR | $ 1,766 |  |  |  | $ 2,543 |  |  |  | 1,766 | 2,543 | 1,329
Common stock issued in business acquisition |  |  |  |  |  |  |  |  | 20,995 |  |
Parent Company [Member] | Middlefield Banking Company [Member] |  |  |  |  |  |  |  |  |  |  |
Equity method investments, income (loss) |  |  |  |  |  |  |  |  | (337) | (4,710) | (3,703)
Parent Company [Member] | EMORECO [Member] |  |  |  |  |  |  |  |  |  |  |
Equity method investments, income (loss) |  |  |  |  |  |  |  |  | $ (3) | $ 57 | $ 116

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 + Details
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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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