Note 3 - Acquisition Activity - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Aug. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Assets Acquired:
Cash and cash equivalents	$ 3,085
Investment securities, available-for-sale	5,977
Federal Home Loan Bank stock, at cost	565
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans	154,577
Allowance for loan losses
Net loans	154,577
Premises and equipment, net	1,215
Other real estate owned	85
Other assets	223
Core deposit intangible	2,048
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total	167,775
Liabilities Assumed:
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	140,375
Short-term borrowings	10,000
Other liabilities	437
Total liabilities assumed	150,812
Shareholders’ Equity Assumed:
Common stock
Surplus
Accumulated other comprehensive income, net of tax
Retained earnings
Total shareholders’ equity assumed
Total liabilities and shareholders’ equity assumed	150,812
Net assets acquired	16,963
Business Combination, Consideration Transferred, Total	24,398
Goodwill, Ending Balance	7,435	$ 7,435	$ 0
The Peoples Bank [Member]
Assets Acquired:
Cash and cash equivalents	3,085
Investment securities, available-for-sale	5,977
Federal Home Loan Bank stock, at cost	565
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans	156,772
Loans, fair value adjustments	(2,195)
Allowance for loan losses	(1,702)
Allowance for loan losses, fair value adjustments	1,702
Net loans	155,070
Net loans, fair value adjustments	(493)
Premises and equipment, net	1,198
Premises and equipment, net, fair value adjustments	17
Other real estate owned	85
Other assets	551
Other assets, fair value adjustments	(328)
Core deposit intangible
Core deposit intangible, fair value adjustments	2,048
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total	166,531
Total assets acquired, fair value adjustments	1,244
Liabilities Assumed:
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	140,033
Deposits, fair value adjustments	342
Short-term borrowings	10,000
Other liabilities	437
Total liabilities assumed	150,470
Total liabilities assumed, fair value adjustments	342
Shareholders’ Equity Assumed:
Common stock	1,027
Common stock, fair value adjustments	(1,027)
Surplus	5,280
Surplus, fair value adjustments	(5,280)
Accumulated other comprehensive income, net of tax	17
Accumulated other comprehensive income, net of tax, fair value adjustments	(17)
Retained earnings	9,737
Retained earnings, fair value adjustments	(9,737)
Total shareholders’ equity assumed	16,061
Total shareholders’ equity assumed, fair value adjustments	(16,061)
Total liabilities and shareholders’ equity assumed	166,531
Total liabilities and shareholders’ equity assumed, fair value adjustments	(15,719)
Business Combination, Consideration Transferred, Total	23,400
Goodwill, Ending Balance	$ 7,400	$ 7,400