Note 13 - Employee Benefit Plans - Pension Plan Assets Measured and Recorded at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair value of plan assets	$ 10,599	$ 9,482	$ 10,159
Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	10,599	9,482
Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets
Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets
Money Market Funds [Member]
Fair value of plan assets	385	77
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	385	77
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets
Mutual Funds, Debt [Member]
Fair value of plan assets	4,322	4,183
Mutual Funds, Debt [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	4,322	4,183
Mutual Funds, Debt [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets
Mutual Funds, Debt [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets
Mutual Funds, Equity [Member]
Fair value of plan assets	4,981	4,373
Mutual Funds, Equity [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	4,981	4,373
Mutual Funds, Equity [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets
Mutual Funds, Equity [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets
Emclaire Stock [Member]
Fair value of plan assets	911	849
Emclaire Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	911	849
Emclaire Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets
Emclaire Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets