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Note 11 - Stockholders' Equity - Reclassification Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Retiree medical plan $ 1,228 $ 6,598 $ 11,294
Interest and debt costs incurred, net of interest capitalized 24,156 29,068 30,439
Total pre-tax and net of tax amounts $ (197,661) $ (113,495) (153,519)
Reclassification out of Accumulated Other Comprehensive Income [Member]      
Total pre-tax and net of tax amounts     (1,132)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Retiree Medical Plan [Member]      
Retiree medical plan     (1,536)
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]      
Interest and debt costs incurred, net of interest capitalized     $ 404