Note 11 - Property and Equipment, Net - Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property and equipment, gross	$ 1,342,395	$ 1,300,757
Less: accumulated depreciation and depletion	908,891	879,608
Property and equipment, net	433,504	421,149
Equipment and Vehicles [Member]
Property and equipment, gross	870,672	812,388
Mining Properties and Mineral Rights [Member]
Property and equipment, gross	191,982	206,073
Land and Land Improvements [Member]
Property and equipment, gross	108,518	117,714
Building and Building Improvements [Member]
Property and equipment, gross	96,180	94,754
Furniture and Fixtures [Member]
Property and equipment, gross	$ 75,043	$ 69,828

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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