Note 13 - Property and Equipment, Net - Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Property and equipment, gross	$ 1,372,597	$ 1,342,395	$ 1,314,026
Less: accumulated depreciation and depletion	922,347	908,891	887,073
Property and equipment, net	450,250	433,504	426,953
Equipment and Vehicles [Member]
Property and equipment, gross	885,445	870,672	826,472
Mining Properties and Mineral Rights [Member]
Property and equipment, gross	205,908	191,982	202,620
Land and Land Improvements [Member]
Property and equipment, gross	108,397	108,518	116,910
Building and Building Improvements [Member]
Property and equipment, gross	95,895	96,180	96,110
Furniture and Fixtures [Member]
Property and equipment, gross	$ 76,952	$ 75,043	$ 71,914

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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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