Note 13 - Employee Benefit Plans - Pension Plan Assets Measured and Recorded at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair value of plan assets	$ 11,788	$ 11,316	$ 10,599
Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	11,788	11,316
Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Money Market Funds [Member]
Fair value of plan assets	148	143
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	148	143
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Mutual Funds, Debt [Member]
Fair value of plan assets	4,133	4,518
Mutual Funds, Debt [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	4,133	4,518
Mutual Funds, Debt [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	0	0
Mutual Funds, Debt [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Mutual Funds, Equity [Member]
Fair value of plan assets	6,698	5,798
Mutual Funds, Equity [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	6,698	5,798
Mutual Funds, Equity [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	0	0
Mutual Funds, Equity [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Emclaire Stock [Member]
Fair value of plan assets	809	857
Emclaire Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	809	857
Emclaire Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	0	0
Emclaire Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	$ 0	$ 0