Note 11 - Fair Value Measurements - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Securities available for sale	$ 428,144	$ 437,271
Equity securities (included in other assets)	1,200	1,300
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Securities available for sale	68,470	72,044
Agency Collateralized Mortgage Obligations [Member]
Securities available for sale	47,717	25,173
US Government Agencies Debt Securities [Member]
Securities available for sale	127,267	129,505
US Treasury and Government [Member]
Securities available for sale	58,362	63,084
Municipal Notes [Member]
Securities available for sale	126,328	147,465
Fair Value, Recurring [Member]
Securities available for sale	428,144	437,271
Equity securities (included in other assets)	1,193	1,260
Fair Value, Recurring [Member] \| Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Securities available for sale	68,470	72,044
Fair Value, Recurring [Member] \| Agency Collateralized Mortgage Obligations [Member]
Securities available for sale	47,717	25,173
Fair Value, Recurring [Member] \| US Government Agencies Debt Securities [Member]
Securities available for sale	127,267	129,505
Fair Value, Recurring [Member] \| US Treasury and Government [Member]
Securities available for sale	58,362	63,084
Fair Value, Recurring [Member] \| Municipal Notes [Member]
Securities available for sale	126,328	147,465
Fair Value, Nonrecurring [Member]
Impaired Loans	37	54
Fair Value, Nonrecurring [Member] \| Residential Construction Segment [Member]
Impaired Loans	37	27
Fair Value, Nonrecurring [Member] \| Residential Mortgage Segment [Member]
Impaired Loans		27
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Securities available for sale	58,362	63,084
Equity securities (included in other assets)	1,193	1,260
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Securities available for sale	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Agency Collateralized Mortgage Obligations [Member]
Securities available for sale	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| US Government Agencies Debt Securities [Member]
Securities available for sale	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| US Treasury and Government [Member]
Securities available for sale	58,362	63,084
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Municipal Notes [Member]
Securities available for sale	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Nonrecurring [Member]
Impaired Loans	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Nonrecurring [Member] \| Residential Construction Segment [Member]
Impaired Loans	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Nonrecurring [Member] \| Residential Mortgage Segment [Member]
Impaired Loans		0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Securities available for sale	369,782	374,187
Equity securities (included in other assets)	0	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Securities available for sale	68,470	72,044
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Agency Collateralized Mortgage Obligations [Member]
Securities available for sale	47,717	25,173
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| US Government Agencies Debt Securities [Member]
Securities available for sale	127,267	129,505
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| US Treasury and Government [Member]
Securities available for sale	0	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Municipal Notes [Member]
Securities available for sale	126,328	147,465
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Nonrecurring [Member]
Impaired Loans	0	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Nonrecurring [Member] \| Residential Construction Segment [Member]
Impaired Loans	0	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Nonrecurring [Member] \| Residential Mortgage Segment [Member]
Impaired Loans		0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Securities available for sale	0	0
Equity securities (included in other assets)	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Securities available for sale	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Agency Collateralized Mortgage Obligations [Member]
Securities available for sale	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| US Government Agencies Debt Securities [Member]
Securities available for sale	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| US Treasury and Government [Member]
Securities available for sale	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Municipal Notes [Member]
Securities available for sale	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Nonrecurring [Member]
Impaired Loans	37	54
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Nonrecurring [Member] \| Residential Construction Segment [Member]
Impaired Loans	$ 37	27
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Nonrecurring [Member] \| Residential Mortgage Segment [Member]
Impaired Loans		$ 27