Note 10 - Benefit Plans - Investment Assets (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Define Benefit Plan, Investment Assets	$ 15,821
Defined Benefit Plan, Equity Securities, US, Large Cap [Member]
Define Benefit Plan, Investment Assets	4,848
Defined Benefit Plan, Equity Securities, US, Small to Mid Cap [Member]
Define Benefit Plan, Investment Assets	781
Defined Benefit Plan, Equity Securities, Non-US [Member]
Define Benefit Plan, Investment Assets	1,389
Defined Benefit Plan, Fixed Income [Member]
Define Benefit Plan, Investment Assets	7,769
Defined Benefit Plan, Other [Member]
Define Benefit Plan, Investment Assets	1,034
Fair Value, Inputs, Level 1 [Member]
Define Benefit Plan, Investment Assets	15,821
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Large Cap [Member]
Define Benefit Plan, Investment Assets	4,848
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Small to Mid Cap [Member]
Define Benefit Plan, Investment Assets	781
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member]
Define Benefit Plan, Investment Assets	1,389
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Fixed Income [Member]
Define Benefit Plan, Investment Assets	7,769
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Other [Member]
Define Benefit Plan, Investment Assets	1,034
Fair Value, Inputs, Level 2 [Member]
Define Benefit Plan, Investment Assets	0
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, US, Large Cap [Member]
Define Benefit Plan, Investment Assets	0
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, US, Small to Mid Cap [Member]
Define Benefit Plan, Investment Assets	0
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member]
Define Benefit Plan, Investment Assets	0
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Fixed Income [Member]
Define Benefit Plan, Investment Assets	0
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Other [Member]
Define Benefit Plan, Investment Assets	0
Fair Value, Inputs, Level 3 [Member]
Define Benefit Plan, Investment Assets	0
Fair Value, Inputs, Level 3 [Member] | Defined Benefit Plan, Equity Securities, US, Large Cap [Member]
Define Benefit Plan, Investment Assets	0
Fair Value, Inputs, Level 3 [Member] | Defined Benefit Plan, Equity Securities, US, Small to Mid Cap [Member]
Define Benefit Plan, Investment Assets	0
Fair Value, Inputs, Level 3 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member]
Define Benefit Plan, Investment Assets	0
Fair Value, Inputs, Level 3 [Member] | Defined Benefit Plan, Fixed Income [Member]
Define Benefit Plan, Investment Assets	0
Fair Value, Inputs, Level 3 [Member] | Defined Benefit Plan, Other [Member]
Define Benefit Plan, Investment Assets	$ 0