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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Net income | $ 2,489 | $ 1,853 | $ 2,966 | $ 1,041 | $ 3,141 | $ 3,269 | $ 3,290 | $ 3,011 | $ 8,349 | $ 12,711
Other, net |  |  |  |  |  |  |  |  | 551 | (1,867)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 15,082 | 13,459
Stock options exercised |  |  |  |  |  |  |  |  | 12 | 4
Repurchase of treasury shares |  |  |  |  |  |  |  |  | (1,191) | (2,229)
Cash dividends |  |  |  |  |  |  |  |  | 3,834 | 3,685
Net cash used in financing activities |  |  |  |  |  |  |  |  | 197,547 | (86,555)
Parent Company [Member] |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 8,349 | 12,711
Equity method investments, income (loss) |  |  |  |  |  |  |  |  | (4,327) | (9,778)
Stock-based compensation |  |  |  |  |  |  |  |  | 144 | 548
Loss (gain) on equity securities |  |  |  |  |  |  |  |  | 101 | (94)
Other, net |  |  |  |  |  |  |  |  | (609) | 3,095
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 3,658 | 6,482
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 0 | 95
Restricted stock cash portion |  |  |  |  |  |  |  |  | 0 | (44)
Stock options exercised |  |  |  |  |  |  |  |  | 12 | 4
Proceeds from dividend reinvestment plan |  |  |  |  |  |  |  |  | 0 | 372
Repurchase of treasury shares |  |  |  |  |  |  |  |  | (1,191) | (2,229)
Cash dividends |  |  |  |  |  |  |  |  | (3,834) | (3,685)
Net cash used in financing activities |  |  |  |  |  |  |  |  | (5,013) | (5,487)
(Decrease) increase in cash |  |  |  |  |  |  |  |  | (1,355) | 995
CASH AT BEGINNING OF YEAR |  |  |  | $ 2,577 |  |  |  | $ 1,582 | 2,577 | 1,582
CASH AT END OF YEAR | $ 1,222 |  |  |  | $ 2,577 |  |  |  | 1,222 | 2,577
Increase in common stock through increase in other, net |  |  |  |  |  |  |  |  | 0 | 265
Parent Company [Member] | Middlefield Banking Company [Member] |  |  |  |  |  |  |  |  |  |
Equity method investments, income (loss) |  |  |  |  |  |  |  |  | (5,726) | (10,742)
Parent Company [Member] | EMORECO [Member] |  |  |  |  |  |  |  |  |  |
Equity method investments, income (loss) |  |  |  |  |  |  |  |  | $ 1,399 | $ 964

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