NSTS Bancorp, Inc. Annual report [Section 13 and 15(d), not S-K Item 405]

Annual report [Section 13 and 15(d), not S-K Item 405]

Cover
- Document And Entity Information
Financial Statements
Notes to Financial Statements
Accounting Policies
- Significant Accounting Policies (Policies)
Notes Tables
Notes Details

Note 1 - Summary of Significant Accounting Policies (Details Textual)

v3.25.1

Note 1 - Summary of Significant Accounting Policies (Details Textual)		12 Months Ended
	Jan. 18, 2022 USD ($) $ / shares shares	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]		Interest Receivable	Interest Receivable
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss		$ 278,000	$ 351,000
Federal Home Loan Bank Stock		$ 585,000	$ 550,000
Financing Receivable, Number of Portfolios		5
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]		Interest Receivable	Interest Receivable
Financing Receivable, Accrued Interest, after Allowance for Credit Loss		$ 560,000	$ 392,000
Unrecognized Tax Benefits, Ending Balance		$ 0
Number of Operating Segments		1
Number of Reportable Segments		1
Multifamily and Commercial Real Estate [Member] \| First Mortgage Loans [Member]
Financing Receivable, Maximum Term (Year)		30 years
Financing Receivable, Maximum Loan-to-value Ratio		75.00%
Construction Loans [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Minimum Percentage of Loan-to-value Ratio, Requires Mortgage Insurance		80.00%
Subscription Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares) \| shares	5,290,000
Shares Issued, Price Per Share (in dollars per share) \| $ / shares	$ 10
Proceeds from Issuance of Common Stock	$ 53,000,000
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) \| shares	107,959

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The maximum loan-to-value ratio on financing receivable.

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Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount of unrecognized tax benefits.

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