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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Service cost $ 320 $ 245 $ 231
Interest cost 404 358 372
Amortization of prior service cost 257 228 228
Amortization of losses 20 57 31
Net periodic cost $ 1,001 $ 888 $ 862
Assumed discount rate 3.10% 4.28% 3.85%