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Note 3 - Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized cost	$ 20,467	$ 23,538
Gross unrealized gains	284	292
Gross unrealized losses	0	(1)
Fair value	20,751	23,829
Certificates of Deposit [Member]
Amortized cost	12,389	15,117
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	12,389	15,117
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	402	402
Gross unrealized gains	5	7
Gross unrealized losses	0	0
Fair value	407	409
Residential Mortgage Backed Securities [Member]
Amortized cost	5,652	5,826
Gross unrealized gains	274	282
Gross unrealized losses	0	0
Fair value	5,926	6,108
Collateralized Mortgage Backed Securities [Member]
Amortized cost	2,024	2,193
Gross unrealized gains	5	3
Gross unrealized losses	0	(1)
Fair value	$ 2,029	$ 2,195

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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