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Note 4 - Investment Securities - Summary of Investment Securities With Unrealized Losses (Details) $ in Thousands	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Less than Twelve Months Unrealized Losses, available for sale	$ (175)	$ (56)
Less than Twelve Months Estimated Fair Value, available for sale	$ 46,803	$ 11,410
Available for sale, Total No. of Issuances, less than twelve months	15	11
Twelve Months or More Unrealized Losses	$ 0	$ 39
Twelve Months or More Estimated Fair Value, available for sale	$ 0	$ 4,865
Twelve Months or More No. of Issuances, available for sale	0	8
Total Unrealized Losses, available for sale	$ (175)	$ (95)
Total Estimated Fair Value, available for sale	$ 46,803	$ 16,275
Available for sale, Total No. of Issuances	15	19
Available for sale, Total No. of Issuances	15	19
Less than Twelve Months Unrealized Losses, held to maturity	$ 0	$ 0
Less than Twelve Months Estimated Fair Value, held to maturity	$ 0	$ 0
Held to maturity, Total No. of Issuances, less than twelve months	0	0
Twelve Months or More Unrealized Losses, held to maturity	$ 0	$ 0
Twelve Months or More Estimated Fair Value, held to maturity	$ 0	$ 0
Twelve Months or More No. of Issuances, held to maturity	0	0
Total Unrealized Losses, held to maturity	$ 0	$ 0
Total Estimated Fair Value, held to maturity	$ 0	$ 0
Held to maturity, Total No. of Issuances	0	0
Twelve Months or More Unrealized Losses	$ 0	$ (39)
Held to maturity, Total No. of Issuances	0	0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Less than Twelve Months Unrealized Losses, available for sale	$ (6)	$ (5)
Less than Twelve Months Estimated Fair Value, available for sale	$ 9,998	$ 2,631
Available for sale, Total No. of Issuances, less than twelve months	2	4
Twelve Months or More Unrealized Losses	$ 0	$ 24
Twelve Months or More Estimated Fair Value, available for sale	$ 0	$ 3,912
Twelve Months or More No. of Issuances, available for sale	0	6
Total Unrealized Losses, available for sale	$ (6)	$ (29)
Total Estimated Fair Value, available for sale	$ 9,998	$ 6,543
Available for sale, Total No. of Issuances	2	10
Available for sale, Total No. of Issuances	2	10
Twelve Months or More Unrealized Losses	$ 0	$ (24)
Collateralized Mortgage Obligations [Member]
Less than Twelve Months Unrealized Losses, available for sale	(91)	(10)
Less than Twelve Months Estimated Fair Value, available for sale	$ 29,260	$ 5,738
Available for sale, Total No. of Issuances, less than twelve months	6	3
Twelve Months or More Unrealized Losses		$ 15
Twelve Months or More Estimated Fair Value, available for sale		$ 953
Twelve Months or More No. of Issuances, available for sale		2
Total Unrealized Losses, available for sale	$ (91)	$ (25)
Total Estimated Fair Value, available for sale	$ 29,260	$ 6,691
Available for sale, Total No. of Issuances	6	5
Available for sale, Total No. of Issuances	6	5
Twelve Months or More Unrealized Losses		$ (15)
Corporate Debt Securities [Member]
Less than Twelve Months Unrealized Losses, available for sale	(42)
Less than Twelve Months Estimated Fair Value, available for sale	$ 5,958
Available for sale, Total No. of Issuances, less than twelve months	4
Twelve Months or More Unrealized Losses	$ 0
Twelve Months or More Estimated Fair Value, available for sale	$ 0
Twelve Months or More No. of Issuances, available for sale	0
Total Unrealized Losses, available for sale	$ (42)
Total Estimated Fair Value, available for sale	$ 5,958
Available for sale, Total No. of Issuances	4
Available for sale, Total No. of Issuances	4
Twelve Months or More Unrealized Losses	$ 0
Municipal Bonds [Member]
Less than Twelve Months Unrealized Losses, available for sale	(36)
Less than Twelve Months Estimated Fair Value, available for sale	$ 1,587
Available for sale, Total No. of Issuances, less than twelve months	3
Twelve Months or More Unrealized Losses
Twelve Months or More Estimated Fair Value, available for sale
Twelve Months or More No. of Issuances, available for sale
Total Unrealized Losses, available for sale	$ (36)
Total Estimated Fair Value, available for sale	$ 1,587
Available for sale, Total No. of Issuances	3
Available for sale, Total No. of Issuances	3
Twelve Months or More Unrealized Losses
US Government Agencies Debt Securities [Member]
Less than Twelve Months Unrealized Losses, available for sale		(19)
Less than Twelve Months Estimated Fair Value, available for sale		$ 1,572
Available for sale, Total No. of Issuances, less than twelve months		2
Twelve Months or More Unrealized Losses		$ 0
Twelve Months or More Estimated Fair Value, available for sale		$ 0
Twelve Months or More No. of Issuances, available for sale		0
Total Unrealized Losses, available for sale		$ (19)
Total Estimated Fair Value, available for sale		$ 1,572
Available for sale, Total No. of Issuances		2
Available for sale, Total No. of Issuances		2
Twelve Months or More Unrealized Losses		$ 0
Small Business Administration Agency Securities [Member]
Less than Twelve Months Unrealized Losses, available for sale		(22)
Less than Twelve Months Estimated Fair Value, available for sale		$ 1,469
Available for sale, Total No. of Issuances, less than twelve months		2
Twelve Months or More Unrealized Losses		$ 0
Twelve Months or More Estimated Fair Value, available for sale		$ 0
Twelve Months or More No. of Issuances, available for sale		0
Total Unrealized Losses, available for sale		$ (22)
Total Estimated Fair Value, available for sale		$ 1,469
Available for sale, Total No. of Issuances		2
Available for sale, Total No. of Issuances		2
Twelve Months or More Unrealized Losses		$ 0

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