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Note 6 - Fair Value - Schedule of Assets and Liabilities Measured on Nonrecurring Basis (Details) - USD ($)
Mar. 31, 2025
Dec. 31, 2024
Reported Value Measurement [Member]    
Loans $ 704,075 $ 714,337
Borrowings 139,773 172,173
Reported Value Measurement [Member] | Certificates of Deposit [Member]    
Certificates of deposit 475,985 493,280
Estimate of Fair Value Measurement [Member]    
Loans 672,865 686,977
Borrowings 140,429 172,575
Estimate of Fair Value Measurement [Member] | Certificates of Deposit [Member]    
Certificates of deposit 476,097 493,769
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 140,429 172,575
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]    
Certificates of deposit 476,097 493,769
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Loans 672,865 686,977
Borrowings 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member]    
Certificates of deposit $ 0 $ 0