Note 8 - Employee Benefit Plans - Fair Value Measurements (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Fair value, plan assets		$ 29,746	$ 36,187
Fair Value, Inputs, Level 1 [Member]
Fair value, plan assets		22,734	29,127
Fair Value, Inputs, Level 2 [Member]
Fair value, plan assets		7,012	7,060
Cash [Member]
Fair value, plan assets		415	1,390
Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value, plan assets		415	1,390
Defined Benefit Plan, Equity Securities, US [Member]
Fair value, plan assets		15,459	19,758
Defined Benefit Plan, Equity Securities, US [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value, plan assets		15,459	19,758
Defined Benefit Plan, Equity Securities, Non-US [Member]
Fair value, plan assets		770	2,722
Defined Benefit Plan, Equity Securities, Non-US [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value, plan assets		770	2,722
Equity Funds [Member]
Fair value, plan assets	[1]	6,090	5,257
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value, plan assets	[1]	6,090	5,257
US States and Political Subdivisions Debt Securities [Member]
Fair value, plan assets		51	57
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value, plan assets		51	57
Corporate Debt Securities [Member]
Fair value, plan assets	[2]	6,961	7,003
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value, plan assets	[2]	$ 6,961	$ 7,003

[1] This category comprises actively managed equity funds invested in large-cap and mid-cap U.S. companies.

[2] This category represents investment grade bonds of U.S. issuers from diverse industries.