NSTS Bancorp, Inc. Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Value Hierarchy of Certain Financial Information (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Reported Value Measurement [Member]
Loans, net	$ 106,810	$ 103,359
Loans held for sale	177
Interest-bearing deposits	153,069	165,737
Other Borrowings	5,000
Estimate of Fair Value Measurement [Member]
Loans, net	95,091	94,779
Loans held for sale	182
Interest-bearing deposits	152,723	165,535
Other Borrowings	4,982
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Loans, net	0	0
Loans held for sale	0
Interest-bearing deposits	0	0
Other Borrowings	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Loans, net	0	0
Loans held for sale	182
Interest-bearing deposits	152,723	165,535
Other Borrowings	4,982
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Loans, net	95,091	94,779
Loans held for sale	0
Interest-bearing deposits	0	$ 0
Other Borrowings	$ 0