Note 14 - Leases (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Lease, Cost [Table Text Block]

	December 31,
	2021		2020
Fixed operating lease expense	$	17,695	$	24,359
Variable operating lease expense		6,884		3,835
Total operating lease expense	$	24,579	$	28,194

	December 31,
	2021		2020
Cash paid for amounts included in the measurement of operating lease liabilities	$	25,330	$	24,293
Cash paid for early buyout of existing operating lease for longwall shields		18,380		—
ROU assets obtained in exchange for operating lease obligations		—		—

	December 31,
	2021		2020
Amortization of right of use assets	$	27,846	$	24,066
Interest expense		3,501		2,375
Total finance lease expense	$	31,347	$	26,441

	December 31,			December 31,
	2021			2021
Weighted average remaining lease term (in years)		2.03			2.68
Weighted average discount rate		6.21	%		5.79	%

Assets and Liabilities, Lessee [Table Text Block]

		December 31,
Lease Assets and Liabilities	Classification	2021			2020
Assets:
Operating Lease ROU Assets	Other Assets	$	21,956		$	53,436
Liabilities:
Current:
Operating Lease Liabilities	Operating Lease Liabilities	$	6,682		$	20,241
Long-Term:
Operating Lease Liabilities	Operating Lease Liabilities	$	15,274		$	35,655
Total Operating Lease Liabilities		$	21,956		$	55,896
Weighted average remaining lease term (in years)			3.98			4.65
Weighted average discount rate			6.78	%		6.84	%

Lessee, Lease, Liability, Maturity [Table Text Block]

	Finance		Operating
	Leases		Leases
2022	$	22,906	$	7,929
2023		22,167		5,585
2024		5,190		4,843
2025		366		3,322
2026		19		3,322
Thereafter		—		277
Total minimum lease payments		50,648		25,278
Less amount representing interest		3,307		3,322
Present value of minimum lease payments	$	47,341	$	21,956