NSTS Bancorp, Inc. Quarterly report [Sections 13 or 15(d)]

Quarterly report [Sections 13 or 15(d)]

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

Note 12 - Subsequent Events (Details Textual)

v3.26.1

Note 12 - Subsequent Events (Details Textual) - USD ($)		3 Months Ended			12 Months Ended
Note 12 - Subsequent Events (Details Textual) - USD ($)	May 12, 2026	Jun. 30, 2026	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2026	Dec. 31, 2025
Share-Based Payment Arrangement, Expense			$ 173,000	$ 157,000
Bank Owned Life Insurance Income			$ 60,000	56,000
Common Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.01			$ 0.01
Subsequent Event [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01
Subsequent Event [Member] \| Brookfield Merger [Member]
Business Combination, Consideration Transferred	$ 73,662,000
Business Combination, Price Per Share (in dollars per share)	$ 14.28
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense			$ 86,000	$ 73,000
Forecast [Member] \| Executive Vice President of the Company and Chief Executive Officer and President of the Bank [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares)		51,000
Bank Owned Life Insurance Income					$ 8
Forecast [Member] \| Executive Vice President of the Company and Chief Executive Officer and President of the Bank [Member] \| Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)		20,400
Share-Based Payment Arrangement, Expense		$ 141,000
Forecast [Member] \| Executive Vice President of the Company and Chief Executive Officer and President of the Bank [Member] \| Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense		$ 134,000

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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