Note 19 - Fair Value Measurements - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Securities available for sale	$ 437,271	$ 460,819
Equity securities (included in other assets)	1,300	1,500
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available for sale	72,044	83,863
Agency Collateralized Mortgage Obligations [Member]
Securities available for sale	25,173	9,353
US Government Agencies Debt Securities [Member]
Securities available for sale	129,505	137,981
US Treasury and Government [Member]
Securities available for sale	63,084	78,732
Municipal Notes [Member]
Securities available for sale	147,465	150,890
Fair Value, Recurring [Member]
Securities available for sale	437,271	460,819
Equity securities (included in other assets)	1,260	1,467
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available for sale	72,044	83,863
Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]
Securities available for sale	25,173	9,353
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]
Securities available for sale	129,505	137,981
Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available for sale	63,084	78,732
Fair Value, Recurring [Member] | Municipal Notes [Member]
Securities available for sale	147,465	150,890
Fair Value, Nonrecurring [Member]
Impaired loans	54
Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]
Impaired loans	27
Fair Value, Nonrecurring [Member] | Residential Construction Segment [Member]
Impaired loans	27
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Securities available for sale	63,084	78,732
Equity securities (included in other assets)	1,260	1,467
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [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	63,084	78,732
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
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]
Impaired loans	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Residential Construction Segment [Member]
Impaired loans	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Securities available for sale	374,187	382,087
Equity securities (included in other assets)	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available for sale	72,044	83,863
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]
Securities available for sale	25,173	9,353
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]
Securities available for sale	129,505	137,981
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	147,465	150,890
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]
Impaired loans	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]
Impaired loans	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Residential Construction 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 Securities, Issued by US Government Sponsored Enterprises [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	54
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]
Impaired loans	27
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Residential Construction Segment [Member]
Impaired loans	$ 27