Note 2 - Earnings Per Share - Weighted Average Shares Used in Basic and Dilutive Earnings Per Share Computations (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net Income Attributable to Quaint Oak Bancorp, Inc.	$ 2,248,000	$ 1,030,000
Weighted average shares outstanding – basic (in shares)	2,013,638	1,980,007
Effect of dilutive common stock equivalents (in shares)	123,484	86,403
Adjusted weighted average shares outstanding – diluted (in shares)	2,137,122	2,066,411
Basic earnings per share (in dollars per share)	$ 1.12	$ 0.52
Diluted earnings per share (in dollars per share)	$ 1.05	$ 0.50