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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