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Note 13 - Employee and Postretirement Benefit Plans - Items Included in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Pension Plan [Member]    
Prior service cost $ 0 $ 0
Net actuarial loss (gain) 255 299
Total 255 299
Other Postretirement Benefits Plan [Member]    
Prior service cost (248) (279)
Net actuarial loss (gain) (236) (194)
Total $ (484) $ (473)