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Note 15 - Fair Values of Financial Instruments - Carrying Amount and Fair Value of Financial Instruments Included in the Consolidated Balance Sheet (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Debt securities, fair value $ 186,270,000 $ 113,041,000
Securities - equities 5,000 15,000
Loans held for sale 469,000 75,000
Federal bank stock 5,715,000 5,635,000
Fair Value, Inputs, Level 1 [Member]    
Debt securities, fair value 0 0
Securities - equities 5,000 15,000
Fair Value, Inputs, Level 2 [Member]    
Debt securities, fair value 182,685,000 111,035,000
Securities - equities 0 0
Fair Value, Inputs, Level 3 [Member]    
Debt securities, fair value 3,585,000 2,006,000
Securities - equities 0 0
Reported Value Measurement [Member]    
Cash and cash equivalents 9,080,000 37,439,000
Interest earning time deposits 2,484,000 5,718,000
Debt securities, fair value 186,270,000 113,041,000
Securities - equities 5,000 15,000
Loans held for sale 469,000 75,000
Loans, net 780,010,000 800,338,000
Federal bank stock 5,715,000 5,635,000
Accrued interest receivable 3,731,000 3,786,000
Deposits 918,496,000 893,627,000
Borrowed funds 22,050,000 32,050,000
Accrued interest payable 338,000 474,000
Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 9,080,000 37,439,000
Interest earning time deposits 0 5,718,000
Debt securities, fair value 0 113,041,000
Securities - equities 5,000 15,000
Loans held for sale 0 75,000
Loans, net 0 807,170,000
Accrued interest receivable 35,000 3,786,000
Deposits 767,840,000 899,446,000
Borrowed funds 0 33,256,000
Accrued interest payable 5,000 474,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 0 37,439,000
Interest earning time deposits 0 0
Debt securities, fair value 3,585,000 0
Securities - equities 0 15,000
Loans held for sale 0 0
Loans, net 780,086,000 0
Accrued interest receivable 2,879,000 52,000
Deposits 0 705,680,000
Borrowed funds 0 0
Accrued interest payable $ 0 19,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and cash equivalents   0
Interest earning time deposits   5,718,000
Debt securities, fair value   111,035,000
Securities - equities   0
Loans held for sale   75,000
Loans, net   0
Accrued interest receivable   513,000
Deposits   193,766,000
Borrowed funds   33,256,000
Accrued interest payable   455,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and cash equivalents   0
Interest earning time deposits   0
Debt securities, fair value   2,006,000
Securities - equities   0
Loans held for sale   0
Loans, net   807,170,000
Accrued interest receivable   3,221,000
Deposits   0
Borrowed funds   0
Accrued interest payable   $ 0