Documentation: An additional amount held in risk-based capital designed to ensure that banks build up capital buffers outside periods of stress which can be drawn down as losses are incurred. The requirement is based on simple capital conservation rules designed to avoid breaches of minimum capital requirements.

No definition available.

Note 14 - Regulatory Matters & Subsequent Event (Details Textual) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended	12 Months Ended
	Jan. 22, 2020	Feb. 08, 2019	Jan. 01, 2015	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2014
Stock Issued During Period, Shares, New Issues		3,285,550
Shares Issued, Price Per Share		$ 7
Shares Issued, Underwriting Discount Per Share		$ 0.35
Proceeds from Issuance of Common Stock		$ 21,300			$ 21,342	$ 117
Common Stock, Dividends, Per Share, Declared					$ 0.20	$ 0.17
Stock Issued During Period, Shares, Dividend Reinvestment Plan					7,369	17,050
Capital Required for Capital Adequacy to Risk Weighted Assets			8.00%		8.00%	8.00%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets			6.00%		6.00%	6.00%	4.00%
Common Equity Tier One Capital Required for Capital Adequacy to Risk-weighted Assets			4.50%		4.50%	4.50%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets			4.00%		4.00%	4.00%
Capital Conservation Buffer					2.50%	1.875%
Common Equity Tier One Capital Conservation Buffer Implementation of Deductions and Other Adjustments to Common Equity Tier One Capital Phase in Percentage Year			40.00%
Common Equity Tier One Capital Conservation Buffer Implementation of Deductions and Other Adjustments to Common Equity Tier One Capital Phase in Percentage Year 2			60.00%
Common Equity Tier One Capital Conservation Buffer Implementation of Deductions and Other Adjustments to Common Equity Tier One Capital Phase in Percentage After Year Two			20.00%
Capital Required to be Well Capitalized to Risk Weighted Assets			10.00%		10.00%	10.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets			8.00%		8.00%	8.00%	6.00%
Common Equity Tier One Capital Required to Be Well Capitalized to Risk-weighted Assets			6.50%		6.50%	6.50%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets			5.00%		5.00%	5.00%
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.055
Dividends Payable, Date to be Paid	Mar. 16, 2020
Dividends Payable, Date of Record	Mar. 02, 2020
FNCB Bank [Member]
Payments for Capital Investment in Wholly Owned Subsidiary				$ 17,800
Over-Allotment Option [Member]
Stock Issued During Period, Shares, New Issues		428,550