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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