NSTS Bancorp, Inc. Annual report pursuant to Section 13 and 15(d)

Note 15 - Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Value Hierarchy of Certain Financial Information (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Reported Value Measurement [Member]
Loans, net	$ 103,359	$ 96,534
Interest-bearing deposits	165,737	186,531
Loans held for sale		104
Estimate of Fair Value Measurement [Member]
Loans, net	94,779	96,391
Interest-bearing deposits	165,535	181,564
Loans held for sale		112
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Loans, net	0	0
Interest-bearing deposits	0	0
Loans held for sale		0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Loans, net	0	0
Interest-bearing deposits	165,535	181,564
Loans held for sale		112
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Loans, net	94,779	96,391
Interest-bearing deposits	$ 0	0
Loans held for sale		$ 0