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Note 16 - Condensed Parent Only Financial Information | 12 Months Ended
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Dec. 31, 2025
Notes to Financial Statements |
Condensed Financial Information of Parent Company Only Disclosure [Text Block] | Note 16: Condensed Parent Only Financial Information The Parent Company’s condensed balance sheet and related condensed statements of operations and cash flows are as follows. NSTS BANCORP, INC. Condensed Balance Sheets
|  | Year ended December 31, |
|  | 2025 |  |  | 2024 |
|  | (Dollars in thousands) |
Assets: |  |  |  |  |  |  |  |
Cash |  | $ | 15,860 |  |  | $ | 16,855 |
Investment in subsidiary |  |  | 60,606 |  |  |  | 56,028 |
Loan to ESOP |  |  | 3,627 |  |  |  | 3,800 |
Other assets |  |  | 15 |  |  |  | 15 |
Total assets |  | $ | 80,108 |  |  | $ | 76,698 |
Liabilities: |  |  |  |  |  |  |  |
Accrued expense and other liabilities |  | $ | 134 |  |  | $ | 208 |
Total liabilities |  |  | 134 |  |  |  | 208 |
Stockholders' equity |  |  |  |  |  |  |  |
Common Stock |  |  | 56 |  |  |  | 56 |
Treasury Stock |  |  | (3,087 | ) |  |  | (3,240 | )
Additional paid-in capital |  |  | 52,348 |  |  |  | 51,684 |
Retained earnings |  |  | 39,880 |  |  |  | 40,266 |
Unallocated common shares held by ESOP |  |  | (3,462 | ) |  |  | (3,670 | )
Accumulated other comprehensive loss, net |  |  | (5,761 | ) |  |  | (8,606 | )
Total stockholders' equity |  |  | 79,974 |  |  |  | 76,490 |
Total liabilities and stockholders’ equity |  | $ | 80,108 |  |  | $ | 76,698 |
NSTS BANCORP, INC. Condensed Statements of Operations
|  | Year ended December 31, |
|  | 2025 |  |  | 2024 |
|  | (Dollars in thousands) |
Income: |  |  |  |  |  |  |  |
Interest income |  | $ | 124 |  |  | $ | 129 |
Total income |  |  | 124 |  |  |  | 129 |
Expense: |  |  |  |  |  |  |  |
Noninterest expense |  | $ | 1,319 |  |  | $ | 1,313 |
Total expense |  |  | 1,319 |  |  |  | 1,313 |
Losses before income tax expense and equity in undistributed earnings of subsidiary |  | $ | (1,195 | ) |  | $ | (1,184 | )
Income tax expense |  |  | — |  |  |  | — |
Losses before equity in undistributed earnings of subsidiary |  | $ | (1,195 | ) |  | $ | (1,184 | )
Equity in undistributed earnings of subsidiary |  |  | 809 |  |  |  | 395 |
Net loss |  | $ | (386 | ) |  | $ | (789 | )
NSTS BANCORP, INC. Condensed Statements of Cash Flows
|  | Year ended December 31, |
|  | 2025 |  |  | 2024 |
|  | (Dollars in thousands) |
Cash flows from operating activities: |  |  |  |  |  |  |  |
Net loss |  | $ | (386 | ) |  | $ | (789 | )
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |  |  |  |  |
Net change in other assets |  |  | — |  |  |  | (8 | )
Net change in accrued expenses and other liabilities |  |  | (74 | ) |  |  | 104 |
Equity in undistributed earnings of subsidiary |  |  | (809 | ) |  |  | (395 | )
Net cash used in operating activities |  |  | (1,269 | ) |  |  | (1,088 | )
Cash flows from investing activities: |  |  |  |  |  |  |  |
Principal payments on loan to ESOP |  | $ | 173 |  |  | $ | 173 |
Net cash provided by investing activities |  |  | 173 |  |  |  | 173 |
Cash flows from financing activities: |  |  |  |  |  |  |  |
Purchase of treasury shares |  |  | — |  |  |  | (970 | )
Purchase of treasury stock from taxes withheld on stock awards |  |  | (114 | ) |  |  | (109 | )
Proceeds from exercise of stock options |  |  | 215 |  |  |  | 215 |
Net cash provided by (used in) financing activities |  |  | 101 |  |  |  | (864 | )
Net change in cash |  |  | (995 | ) |  |  | (1,779 | )
Cash at beginning of period |  |  | 16,855 |  |  |  | 18,634 |
Cash at end of period |  | $ | 15,860 |  |  | $ | 16,855 |

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- Definition The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 Reference 4: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 810 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481231/810-10-45-11 + Details
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