Note 18 - Employee Benefit Plans - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair value of plan assets	$ 5,045	$ 4,701	$ 5,915	$ 5,653
Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	2,197	1,619
Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	2,848	3,082
Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Defined Benefit Plan, Cash [Member]
Fair value of plan assets	1,042	138
Defined Benefit Plan, Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	1,042	138
Defined Benefit Plan, Cash [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	0	0
Defined Benefit Plan, Cash [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Fixed Income Securities, Government Sponsored Entities [Member]
Fair value of plan assets	469	444
Fixed Income Securities, Government Sponsored Entities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	0	0
Fixed Income Securities, Government Sponsored Entities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	469	444
Fixed Income Securities, Government Sponsored Entities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Fixed Income Securities, Municipal Bonds and Notes [Member]
Fair value of plan assets	2,067	2,147
Fixed Income Securities, Municipal Bonds and Notes [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	0	0
Fixed Income Securities, Municipal Bonds and Notes [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	2,067	2,147
Fixed Income Securities, Municipal Bonds and Notes [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Fixed Income Securities, Corporate Bonds and Notes [Member]
Fair value of plan assets	312	491
Fixed Income Securities, Corporate Bonds and Notes [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	0	0
Fixed Income Securities, Corporate Bonds and Notes [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	312	491
Fixed Income Securities, Corporate Bonds and Notes [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Defined Benefit Plan, Equity Securities, US Companies [Member]
Fair value of plan assets	964	1,259
Defined Benefit Plan, Equity Securities, US Companies [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	964	1,259
Defined Benefit Plan, Equity Securities, US Companies [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	0	0
Defined Benefit Plan, Equity Securities, US Companies [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Defined Benefit Plan, Equity Securities, Foreign Companies [Member]
Fair value of plan assets	191	222
Defined Benefit Plan, Equity Securities, Foreign Companies [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	191	222
Defined Benefit Plan, Equity Securities, Foreign Companies [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	0	0
Defined Benefit Plan, Equity Securities, Foreign Companies [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	$ 0	$ 0