Note 12 - Operating Segments - Summary of Financial Information for the Reportable Segments (Details) - USD ($)	3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2019	Jun. 30, 2018		Dec. 31, 2018
Net Interest Income	$ 2,098,000	$ 2,060,000		$ 4,235,000	$ 4,039,000
Provision for Loan Losses	76,000	94,000		161,000	165,000		$ 415,000
Net Interest Income after Provision for Loan Losses	2,022,000	1,966,000		4,074,000	3,874,000
Non-Interest Income
Insurance commissions	106,000	103,000		198,000	182,000
Income from bank-owned life insurance	19,000	21,000		39,000	41,000
Net gain on loans held for sale	867,000	585,000		1,300,000	906,000
Gain on the sale of SBA loans	34,000			140,000	23,000
Gain on sales of other real estate owned					63,000
Total Non-Interest Income	1,446,000	1,020,000		2,288,000	1,762,000
Non-Interest Expense
Salaries and employee benefits	1,771,000	1,621,000		3,397,000	3,289,000
Directors’ fees and expenses	56,000	40,000		113,000	94,000
Occupancy and equipment	174,000	146,000		334,000	296,000
Data processing	118,000	93,000		220,000	179,000
Professional fees	92,000	123,000		174,000	183,000
FDIC deposit insurance assessment	12,000	46,000		40,000	93,000
Other real estate owned expenses	4,000	2,000		11,000	2,000
Advertising	71,000	54,000		142,000	108,000
Amortization of Intangible Assets, Total	12,000	12,000		24,000	24,000
Other	217,000	144,000		379,000	320,000
Total Non-Interest Expense	2,527,000	2,281,000		4,834,000	4,588,000
Pretax Segment Profit	941,000	705,000		1,528,000	1,048,000
Segment Assets	284,877,000	251,562,000		284,877,000	251,562,000		271,404,000
Net Interest Income	2,098,000	2,060,000		4,235,000	4,039,000
Provision for Loan Losses	76,000	94,000		161,000	165,000		$ 415,000
Net Interest Income after Provision for Loan Losses	2,022,000	1,966,000		4,074,000	3,874,000
Mortgage Banking and Abstract Fees [Member]
Non-Interest Income
Non-interest revenue	325,000	217,000		470,000	327,000
Real Estate Sales Commissions [Member]
Non-Interest Income
Non-interest revenue	33,000	50,000		51,000	102,000
Other Fees and Services Fees [Member]
Non-Interest Income
Non-interest revenue	62,000	44,000		90,000	118,000
Quaint Oak Bank [Member]
Net Interest Income	2,123,000	2,067,000	[1]	4,279,000	4,056,000	[1]
Provision for Loan Losses	76,000	94,000	[1]	161,000	165,000	[1]
Net Interest Income after Provision for Loan Losses	2,047,000	1,973,000	[1]	4,118,000	3,891,000	[1]
Non-Interest Income
Insurance commissions	106,000	103,000	[1]	198,000	182,000	[1]
Income from bank-owned life insurance	19,000	21,000	[1]	39,000	41,000	[1]
Net gain on loans held for sale			[1]		3,000	[1]
Gain on the sale of SBA loans	34,000		[1]	140,000	23,000	[1]
Gain on sales of other real estate owned			[1]		63,000	[1]
Total Non-Interest Income	430,000	354,000	[1]	779,000	774,000	[1]
Non-Interest Expense
Salaries and employee benefits	1,465,000	1,323,000	[1]	2,787,000	2,691,000	[1]
Directors’ fees and expenses	56,000	40,000	[1]	113,000	94,000	[1]
Occupancy and equipment	117,000	107,000	[1]	228,000	217,000	[1]
Data processing	81,000	67,000	[1]	161,000	129,000	[1]
Professional fees	79,000	110,000	[1]	148,000	157,000	[1]
FDIC deposit insurance assessment	12,000	46,000	[1]	40,000	93,000	[1]
Other real estate owned expenses	4,000	2,000	[1]	11,000	2,000	[1]
Advertising	61,000	49,000	[1]	122,000	98,000	[1]
Amortization of Intangible Assets, Total	12,000	12,000	[1]	24,000	24,000	[1]
Other	205,000	131,000	[1]	353,000	289,000	[1]
Total Non-Interest Expense	2,092,000	1,887,000	[1]	3,987,000	3,794,000	[1]
Pretax Segment Profit	385,000	440,000	[1]	910,000	871,000	[1]
Segment Assets	269,302,000	246,844,000	[1]	269,302,000	246,844,000	[1]
Net Interest Income	2,123,000	2,067,000	[1]	4,279,000	4,056,000	[1]
Provision for Loan Losses	76,000	94,000	[1]	161,000	165,000	[1]
Net Interest Income after Provision for Loan Losses	2,047,000	1,973,000	[1]	4,118,000	3,891,000	[1]
Quaint Oak Bank [Member] | Mortgage Banking and Abstract Fees [Member]
Non-Interest Income
Non-interest revenue	176,000	136,000	[1]	261,000	242,000	[1]
Quaint Oak Bank [Member] | Real Estate Sales Commissions [Member]
Non-Interest Income
Non-interest revenue	33,000	50,000	[1]	51,000	102,000	[1]
Quaint Oak Bank [Member] | Other Fees and Services Fees [Member]
Non-Interest Income
Non-interest revenue	62,000	44,000	[1]	90,000	118,000	[1]
Quaint Oak Bank [Member] | Quaint Oak Bank, Mortgage [Member]
Net Interest Income	(25,000)	(7,000)		(44,000)	(17,000)
Provision for Loan Losses
Net Interest Income after Provision for Loan Losses	(25,000)	(7,000)		(44,000)	(17,000)
Non-Interest Income
Insurance commissions
Income from bank-owned life insurance
Net gain on loans held for sale	867,000	585,000		1,300,000	903,000
Gain on the sale of SBA loans
Gain on sales of other real estate owned
Total Non-Interest Income	1,016,000	666,000		1,509,000	988,000
Non-Interest Expense
Salaries and employee benefits	306,000	298,000		610,000	598,000
Directors’ fees and expenses
Occupancy and equipment	57,000	39,000		106,000	79,000
Data processing	37,000	26,000		59,000	50,000
Professional fees	13,000	13,000		26,000	26,000
FDIC deposit insurance assessment
Other real estate owned expenses
Advertising	10,000	5,000		20,000	10,000
Amortization of Intangible Assets, Total
Other	12,000	13,000		26,000	31,000
Total Non-Interest Expense	435,000	394,000		847,000	794,000
Pretax Segment Profit	556,000	265,000		618,000	177,000
Segment Assets	15,575,000	9,088,000		15,575,000	9,088,000
Net Interest Income	(25,000)	(7,000)		(44,000)	(17,000)
Provision for Loan Losses
Net Interest Income after Provision for Loan Losses	(25,000)	(7,000)		(44,000)	(17,000)
Quaint Oak Bank [Member] | Quaint Oak Bank, Mortgage [Member] | Mortgage Banking and Abstract Fees [Member]
Non-Interest Income
Non-interest revenue	149,000	81,000		209,000	85,000
Quaint Oak Bank [Member] | Quaint Oak Bank, Mortgage [Member] | Real Estate Sales Commissions [Member]
Non-Interest Income
Non-interest revenue
Quaint Oak Bank [Member] | Quaint Oak Bank, Mortgage [Member] | Other Fees and Services Fees [Member]
Non-Interest Income
Non-interest revenue

[1] Includes Quaint Oak Bancorp, Inc. and the Bank's Subsidiaries, Quaint Oak Real Estate, Quaint Oak Abstract, Quaint Oak Insurance Agency, and Quaint Oak Properties.