Note 4 - Loans and Allowance for Loan Losses - Recorded Investment in Nonperforming Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable, Net of Deferred Income, Total	$ 514,766	$ 525,818
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	130,603	131,217
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	19,478	17,328
Commercial Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	51,787	82,274
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	54,453	52,001
Nonperforming Financial Instruments [Member]
Nonaccrual Loans	1,327	1,406
Loans 90+ Days Past Due Still Accruing	3	59
Loans and Leases Receivable, Net of Deferred Income, Total	1,330	1,465
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Nonaccrual Loans	806	1,154
Loans 90+ Days Past Due Still Accruing	0	0
Loans and Leases Receivable, Net of Deferred Income, Total	806	1,154
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Nonaccrual Loans	102	97
Loans 90+ Days Past Due Still Accruing	0	59
Loans and Leases Receivable, Net of Deferred Income, Total	102	156
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]
Nonaccrual Loans	0	0
Loans 90+ Days Past Due Still Accruing	0	0
Loans and Leases Receivable, Net of Deferred Income, Total	0	0
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Nonaccrual Loans	115	155
Loans 90+ Days Past Due Still Accruing	0	0
Loans and Leases Receivable, Net of Deferred Income, Total	115	155
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Nonaccrual Loans	0	0
Loans 90+ Days Past Due Still Accruing	0	0
Loans and Leases Receivable, Net of Deferred Income, Total	0	0
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Nonaccrual Loans	304	0
Loans 90+ Days Past Due Still Accruing	0	0
Loans and Leases Receivable, Net of Deferred Income, Total	304	0
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Nonaccrual Loans	0	0
Loans 90+ Days Past Due Still Accruing	3	0
Loans and Leases Receivable, Net of Deferred Income, Total	$ 3	$ 0