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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Net income | $ 3,425 | $ 3,304 | $ 3,097 | $ 2,605 | $ 2,386 | $ 2,462 | $ 2,507 | $ 2,100 | $ 12,431 | $ 9,455
Loss (gain) on equity securities |  |  |  |  |  |  |  |  | 9 | (488)
Other, net |  |  |  |  |  |  |  |  | 112 | (3,536)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 14,281 | 13,920
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  | 15,164
Stock options exercised |  |  |  |  |  |  |  |  | 168 | 184
Cash dividends |  |  |  |  |  |  |  |  | 3,779 | 3,358
Net cash (used in) provided by financing activities |  |  |  |  |  |  |  |  | 130,309 | 88,722
Decrease in cash |  |  |  |  |  |  |  |  | 68,047 | 7,391
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |  |  |  | 39,886 |  |  |  | 32,495 | 39,886 | 32,495
CASH AND CASH EQUIVALENTS AT END OF YEAR | 107,933 |  |  |  | 39,886 |  |  |  | 107,933 | 39,886
Common stock issued in business acquisition |  |  |  |  |  |  |  |  |  | 20,995
Parent Company [Member] |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 12,431 | 9,455
Equity method investments, income (loss) |  |  |  |  |  |  |  |  | (9,712) | (340)
Stock-based compensation |  |  |  |  |  |  |  |  | 371 | 33
Loss (gain) on equity securities |  |  |  |  |  |  |  |  | 9 | (488)
Other, net |  |  |  |  |  |  |  |  | (382) | 282
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 2,717 | 8,942
Acquisition, net of cash paid |  |  |  |  |  |  |  |  |  | (22,249)
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 92 | 15,164
Stock options exercised |  |  |  |  |  |  |  |  | 168 | 184
Proceeds from dividend reinvestment plan |  |  |  |  |  |  |  |  | 618 | 540
Cash dividends |  |  |  |  |  |  |  |  | (3,779) | (3,358)
Net cash (used in) provided by financing activities |  |  |  |  |  |  |  |  | (2,901) | 12,530
Decrease in cash |  |  |  |  |  |  |  |  | (184) | (777)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |  |  |  | $ 1,766 |  |  |  | $ 2,543 | 1,766 | 2,543
CASH AND CASH EQUIVALENTS AT END OF YEAR | $ 1,582 |  |  |  | $ 1,766 |  |  |  | 1,582 | 1,766
Common stock issued in business acquisition |  |  |  |  |  |  |  |  |  | 20,995
Increase in common stock through increase in other, net |  |  |  |  |  |  |  |  | 183 |
Parent Company [Member] | Middlefield Banking Company [Member] |  |  |  |  |  |  |  |  |  |
Equity method investments, income (loss) |  |  |  |  |  |  |  |  | (9,711) | (337)
Parent Company [Member] | EMORECO [Member] |  |  |  |  |  |  |  |  |  |
Equity method investments, income (loss) |  |  |  |  |  |  |  |  | $ (1) | $ (3)

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