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Note 3 - Available-for-sale Securities - Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Available-for-sale securities, amortized cost	$ 124,568	$ 49,960
Available-for-sale securities, gross unrealized gains	533	491
Available-for-sale securities, gross unrealized losses	(998)	(1,189)
Available-for-sale securities	124,103	49,262
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities, amortized cost	89,557	16,719
Available-for-sale securities, gross unrealized gains	154	131
Available-for-sale securities, gross unrealized losses	(693)	(17)
Available-for-sale securities	89,018	16,833
Corporate Debt Securities [Member]
Available-for-sale securities, amortized cost	20,005	18,014
Available-for-sale securities, gross unrealized gains	308	260
Available-for-sale securities, gross unrealized losses	(91)	(984)
Available-for-sale securities	20,222	17,290
Subordinated Notes [Member]
Available-for-sale securities, amortized cost	4,608	9,036
Available-for-sale securities, gross unrealized gains	67	97
Available-for-sale securities, gross unrealized losses	(5)	(128)
Available-for-sale securities	4,670	9,005
SBA Loan Pools [Member]
Available-for-sale securities, amortized cost	9,836	5,627
Available-for-sale securities, gross unrealized gains	3	0
Available-for-sale securities, gross unrealized losses	(205)	(60)
Available-for-sale securities	9,634	5,567
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities, amortized cost	562	564
Available-for-sale securities, gross unrealized gains	1	3
Available-for-sale securities, gross unrealized losses	(4)	0
Available-for-sale securities	$ 559	$ 567

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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