Note 5 - Debt Securities - Schedule of Contractual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Amortized cost basis, due after one year through five years	$ 599
Fair value, due after one year through five years	601
Amortized cost basis, due after five years through ten years	1,424
Fair value, due after five years through ten years	1,414
Amortized cost basis, due after ten years	9,157
Fair value, due after ten years	8,635
Amortized cost basis	29,448	$ 30,509
Debt securities available-for-sale (at fair value)	27,328	28,571
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Amortized cost basis	9,537	10,405
Debt securities available-for-sale (at fair value)	8,730	9,636
Asset-Backed Securities [Member]
Amortized cost basis	8,181	8,319
Debt securities available-for-sale (at fair value)	$ 7,403	$ 7,535