Note 10 - Benefits Plans - Net Period Benefit Cost (Income) (Details) - Pension Plan [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Interest cost	$ 304
Expected return on plan assets	(538)
Amortization of prior service cost (credit)	(26)
Other	0
Net periodic benefit cost (income)	(260)
Net (gain) loss	249
Amortization of prior service (cost) credit	26
Other	0
Net periodic benefit cost (income)	$ 275
Weighted-average assumptions used to determine net cost
Discount rate	2.65%
Expected return on plan assets	5.75%