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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)