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Note 7 - Fair Value (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance $ 69,000 $ 76,000 $ 69,000 $ 76,000 $ 76,000
Impaired Financing Receivable, Related Allowance 15,000 4,000 15,000 4,000 5,000
Provision for Loan and Lease Losses, Total $ 750,000 (145,000) $ 2,642,000 305,000  
Measurement Input, Discount Rate [Member]          
Other Real Estate Owned, Measurement Input 0.1   0.1    
Fair Value, Nonrecurring [Member]          
Provision for Loan and Lease Losses, Total $ 25,000 0 $ 56,000 35,000  
Other Real Estate, Ending Balance 34,000   34,000   88,000
Other Real Estate, Gross Amount 68,000   68,000   91,000
Other Real Estate, Disposals     34,000   3,000
Impaired Loans [Member]          
Provision for Loan and Lease Losses, Total 0 0 31,000 63,000  
Real Estate Loan [Member]          
Impaired Financing Receivable, Unpaid Principal Balance, Total         67,000
Home Equity Loan [Member]          
Impaired Financing Receivable, Unpaid Principal Balance, Total         4,000
Commercial Portfolio Segment [Member]          
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 69,000 69,000
Impaired Financing Receivable, Related Allowance 15,000 15,000
Provision for Loan and Lease Losses, Total (81,000) $ 5,000 232,000 $ 254,000  
Collateral Pledged [Member]          
Impaired Financing Receivable, with Related Allowance, Fair Value         $ 0
Collateral Pledged [Member] | Commercial Portfolio Segment [Member]          
Impaired Financing Receivable, with Related Allowance, Fair Value 54,000   54,000    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 69,000   69,000    
Impaired Financing Receivable, Related Allowance $ 15,000   $ 15,000