Note 13 - Fair Value and Interest Rate Risk - Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Available-for-sale securities	$ 76,971	$ 94,341
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities	54,085	66,629
Corporate Debt Securities [Member]
Available-for-sale securities	15,644	16,921
Subordinated Notes [Member]
Available-for-sale securities	1,921	4,626
SBA Loan Pools [Member]
Available-for-sale securities	4,822	5,603
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities	499	562
Fair Value, Recurring [Member]
Available-for-sale securities	76,971	94,341
Interest rate swap liability	101	738
Fair Value, Recurring [Member] | Interest Rate Swap [Member]
Interest rate swap	101	738
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities	54,085	66,629
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Available-for-sale securities	15,644	16,921
Fair Value, Recurring [Member] | Subordinated Notes [Member]
Available-for-sale securities	1,921	4,626
Fair Value, Recurring [Member] | SBA Loan Pools [Member]
Available-for-sale securities	4,822	5,603
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities	499	562
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Available-for-sale securities	0	0
Interest rate swap liability	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]
Interest rate swap	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Available-for-sale securities	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Subordinated Notes [Member]
Available-for-sale securities	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | SBA Loan Pools [Member]
Available-for-sale securities	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Available-for-sale securities	66,629	81,161
Interest rate swap liability	101	738
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]
Interest rate swap	101	738
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities	54,085	66,629
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Available-for-sale securities	5,302	3,741
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Subordinated Notes [Member]
Available-for-sale securities	1,921	4,626
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | SBA Loan Pools [Member]
Available-for-sale securities	4,822	5,603
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities	499	562
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Available-for-sale securities	10,342	13,180
Interest rate swap liability	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]
Interest rate swap	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Available-for-sale securities	10,342	13,180
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Subordinated Notes [Member]
Available-for-sale securities	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | SBA Loan Pools [Member]
Available-for-sale securities	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities	$ 0	$ 0