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Note 11 - Leases (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2029
Dec. 31, 2028
Dec. 31, 2027
Dec. 31, 2026
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]             Other assets  
Operating Lease, Right-of-Use Asset             $ 23,000  
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]           Accrued expenses and other liabilities Accrued expenses and other liabilities  
Operating Lease, Liability           $ 4,000 $ 23,000  
Operating Lease, Expense           $ 35,000 $ 34,000 $ 32,000
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]           Other income Other income Other income
Operating Lease, Lease Income           $ 61,000 $ 47,000 $ 53,000
Forecast [Member]                
Operating Lease, Lease Income, Lease Payments $ 45,000 $ 49,000 $ 72,000 $ 95,000 $ 110,000      
Minimum [Member]                
Lessee, Operating Lease, Renewal Term           1 year    
Maximum [Member]                
Lessee, Operating Lease, Renewal Term           20 years    
Branch Office Space [Member]                
Lessee, Operating Lease, Annual Lease Payments           $ 19,000