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Note 11 - Fair Value Measurements - Carrying Amount and Fair Values of Financial Instruments (Details) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Servicing Asset at Amortized Cost, Fair Value | $ 1,300,000 | $ 807,000
Advance payments by borrowers for taxes | 26,993,000 | 5,630,000
Reported Value Measurement [Member] |  |
Cash and cash equivalents | 53,768,000 | 39,761,000
Loans receivable | 1,714,836,000 | 1,680,576,000
FHLB stock | 20,707,000 | 20,295,000
Accrued interest receivable | 8,106,000 | 7,853,000
Servicing Asset at Amortized Cost, Fair Value | 1,039,000 | 732,000
Deposits | 1,385,973,000 | 1,359,897,000
Advance payments by borrowers for taxes | 26,993,000 | 5,630,000
Borrowings | 469,061,000 | 446,519,000
Accrued interest payable | 3,815,000 | 3,340,000
Estimate of Fair Value Measurement [Member] |  |
Cash and cash equivalents | 53,768,000 | 39,761,000
Loans receivable | 1,676,396,000 | 1,603,437,000
FHLB stock | 20,707,000 | 20,295,000
Accrued interest receivable | 8,106,000 | 7,853,000
Servicing Asset at Amortized Cost, Fair Value | 1,327,000 | 807,000
Deposits | 1,385,591,000 | 1,359,381,000
Advance payments by borrowers for taxes | 26,993,000 | 5,630,000
Borrowings | 465,283,000 | 439,455,000
Accrued interest payable | 3,815,000 | 3,340,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash and cash equivalents | 53,768,000 | 39,761,000
Loans receivable | 0 | 0
FHLB stock | 20,707,000 | 20,295,000
Accrued interest receivable | 8,106,000 | 7,853,000
Servicing Asset at Amortized Cost, Fair Value | 0 | 0
Deposits | 483,346,000 | 454,358,000
Advance payments by borrowers for taxes | 26,993,000 | 5,630,000
Borrowings | 0 | 0
Accrued interest payable | 3,815,000 | 3,340,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash and cash equivalents | 0 | 0
Loans receivable | 0 | 0
FHLB stock | 0 | 0
Accrued interest receivable | 0 | 0
Servicing Asset at Amortized Cost, Fair Value | 0 | 0
Deposits | 902,245,000 | 905,023,000
Advance payments by borrowers for taxes | 0 | 0
Borrowings | 465,283,000 | 439,455,000
Accrued interest payable | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash and cash equivalents | 0 | 0
Loans receivable | 1,676,396,000 | 1,603,437,000
FHLB stock | 0 | 0
Accrued interest receivable | 0 | 0
Servicing Asset at Amortized Cost, Fair Value | 1,327,000 | 807,000
Deposits | 0 | 0
Advance payments by borrowers for taxes | 0 | 0
Borrowings | 0 | 0
Accrued interest payable | $ 0 | $ 0

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- Definition Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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- Definition Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E + Details
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- Definition Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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