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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