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Note 12 - Employee Benefit Plans - Components of Net Periodic Pension Cost and Assumed Discount Rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Service cost $ 352 $ 310 $ 320
Interest cost 315 355 404
Effect of curtailment 289 0 0
Amortization of prior service cost 124 201 257
Amortization of losses 264 186 20
Net periodic cost $ 1,344 $ 1,052 $ 1,001
Assumed discount rate 2.88% 2.53% 3.10%