Note 8 - Fair Value Measurements - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Securities available for sale	$ 438,168	$ 447,335
Equity securities (included in other assets)	1,900
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available for sale	99,409	102,736
Agency Collateralized Mortgage Obligations [Member]
Securities available for sale	6,283	7,961
US Government Agencies Debt Securities [Member]
Securities available for sale	134,932	129,096
US Treasury and Government [Member]
Securities available for sale	48,766	49,794
Municipal Notes [Member]
Securities available for sale	148,778	157,748
Fair Value, Recurring [Member]
Securities available for sale	438,168	447,335
Equity securities (included in other assets)	1,944	1,881
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available for sale	99,409	102,736
Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]
Securities available for sale	6,283	7,961
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]
Securities available for sale	134,932	129,096
Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available for sale	48,766	49,794
Fair Value, Recurring [Member] | Municipal Notes [Member]
Securities available for sale	148,778	157,748
Fair Value, Nonrecurring [Member]
Impaired loans	309	281
Foreclosed real estate		36
Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]
Impaired loans	27
Foreclosed real estate		36
Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]
Impaired loans	282	281
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Securities available for sale	0	0
Equity securities (included in other assets)	1,944	1,881
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	0	0
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
Foreclosed real estate		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]
Impaired loans	0
Foreclosed real estate		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]
Impaired loans	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Securities available for sale	438,168	447,335
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	99,409	102,736
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]
Securities available for sale	6,283	7,961
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]
Securities available for sale	134,932	129,096
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available for sale	48,766	49,794
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Municipal Notes [Member]
Securities available for sale	148,778	157,748
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]
Impaired loans	0	0
Foreclosed real estate		0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]
Impaired loans	0
Foreclosed real estate		0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]
Impaired loans	0	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	309	281
Foreclosed real estate		36
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]
Impaired loans	27
Foreclosed real estate		36
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]
Impaired loans	$ 282	$ 281