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Note 6 - Fair Value - Schedule of Assets and Liabilities Measured on Nonrecurring Basis (Details) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Reported Value Measurement [Member] |  |
Loans | $ 671,772 | $ 714,337
Borrowings | 119,413 | 172,173
Reported Value Measurement [Member] | Certificates of Deposit [Member] |  |
Certificates of deposit | 502,537 | 493,280
Estimate of Fair Value Measurement [Member] |  |
Loans | 648,287 | 686,977
Borrowings | 120,045 | 172,575
Estimate of Fair Value Measurement [Member] | Certificates of Deposit [Member] |  |
Certificates of deposit | 503,120 | 493,769
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Loans | 0 | 0
Borrowings | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member] |  |
Certificates of deposit | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Loans | 0 | 0
Borrowings | 120,045 | 172,575
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |  |
Certificates of deposit | 503,120 | 493,769
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Loans | 648,287 | 686,977
Borrowings | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member] |  |
Certificates of deposit | $ 0 | $ 0

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