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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Net income | $ 3,141 | $ 3,269 | $ 3,290 | $ 3,011 | $ 3,425 | $ 3,304 | $ 3,097 | $ 2,605 | $ 12,711 | $ 12,431
Other, net |  |  |  |  |  |  |  |  | (1,867) | 112
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 13,459 | 14,281
Stock options exercised |  |  |  |  |  |  |  |  | 4 | 168
Repurchase of treasury shares |  |  |  |  |  |  |  |  | (2,229) |
Cash dividends |  |  |  |  |  |  |  |  | 3,685 | 3,779
Net cash (used in) financing activities |  |  |  |  |  |  |  |  | (86,555) | 130,309
Increase (decrease) in cash |  |  |  |  |  |  |  |  | (72,820) | 68,047
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |  |  |  | 107,933 |  |  |  | 39,886 | 107,933 | 39,886
CASH AND CASH EQUIVALENTS AT END OF YEAR | 35,113 |  |  |  | 107,933 |  |  |  | 35,113 | 107,933
Parent Company [Member] |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 12,711 | 12,431
Equity method investments, income (loss) |  |  |  |  |  |  |  |  | (9,778) | (9,712)
Stock-based compensation |  |  |  |  |  |  |  |  | 548 | 371
(Gain) loss on equity securities |  |  |  |  |  |  |  |  | (94) | 9
Other, net |  |  |  |  |  |  |  |  | 3,095 | (382)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 6,482 | 2,717
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 95 | 92
Restricted stock cash portion |  |  |  |  |  |  |  |  | (44) |
Stock options exercised |  |  |  |  |  |  |  |  | 4 | 168
Proceeds from dividend reinvestment plan |  |  |  |  |  |  |  |  | 372 | 618
Repurchase of treasury shares |  |  |  |  |  |  |  |  | (2,229) |
Cash dividends |  |  |  |  |  |  |  |  | (3,685) | (3,779)
Net cash (used in) financing activities |  |  |  |  |  |  |  |  | (5,487) | (2,901)
Increase (decrease) in cash |  |  |  |  |  |  |  |  | 995 | (184)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |  |  |  | $ 1,582 |  |  |  | $ 1,766 | 1,582 | 1,766
CASH AND CASH EQUIVALENTS AT END OF YEAR | $ 2,577 |  |  |  | $ 1,582 |  |  |  | 2,577 | 1,582
Increase in common stock through increase in other, net |  |  |  |  |  |  |  |  | 265 | 183
Parent Company [Member] | Middlefield Banking Company [Member] |  |  |  |  |  |  |  |  |  |
Equity method investments, income (loss) |  |  |  |  |  |  |  |  | (10,742) | (9,711)
Parent Company [Member] | EMORECO [Member] |  |  |  |  |  |  |  |  |  |
Equity method investments, income (loss) |  |  |  |  |  |  |  |  | $ 964 | $ (1)

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