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Note 13 - Employee Benefit Plans - Components of Net Periodic Pension Cost and Assumed Discount Rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Service cost $ 310 $ 320 $ 245
Interest cost 355 404 358
Amortization of prior service cost 201 257 228
Amortization of losses 186 20 57
Net periodic cost $ 1,052 $ 1,001 $ 888
Assumed discount rate 2.53% 3.10% 4.28%