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

Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)		3 Months Ended	9 Months Ended
	Jan. 18, 2022	Jun. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Proceeds from Issuance of Common Stock			$ 49,440,000	$ 0
Percentage of Qualified Wages, Tax Credit			70.00%
Qualified Wages per Employee			$ 10,000
Non Interest Income [Member]
Employee Retention Credit Amount		$ 503,000
Subscription Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)	5,290,000
Shares Issued, Price Per Share (in dollars per share)	$ 10.00
Proceeds from Issuance of Common Stock	$ 53,000,000.0
Subscription Offering [Member] \| NSTS Charitable Foundation [Member]
Payments of Charitable Contributions	$ 150,000
Subscription Offering [Member] \| NSTS Charitable Foundation [Member] \| Contribution of Nonmonetary Assets to Charitable Organization [Member]
Stock Issued During Period, Shares, New Issues (in shares)	107,959