Note 13 - Employee Benefit Plans - Pension Plan Assets Measured and Recorded at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair value of plan assets	$ 9,482	$ 10,159	$ 9,331
Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	9,482	10,159
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	77	720
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	77	720
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	4,183	3,368
Mutual Funds, Debt [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	4,183	3,368
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	4,373	5,221
Mutual Funds, Equity [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	4,373	5,221
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	849	850
Emclaire Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	849	850
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