Note 1 - Basis of Presentation (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Accounts Receivable, Allowance for Credit Loss [Table Text Block]

Allowance for credit losses, December 31, 2019	$	9,898
Additional provisions		288
Uncollectible accounts written off		—
Allowance for credit losses, September 30, 2020	$	10,186

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]

	September 30, 2020		December 31, 2019
Derivatives - current (1)	$	12,354	$	7,266
Unamortized insurance/bond premiums		5,022		4,357
Prepaid deposits related to royalties		4,473		7,980
Prepayment to vendors		1,264		10,202
Other		494		886
Prepaid expenses and other assets	$	23,607	$	30,691

Property, Plant and Equipment [Table Text Block]

	September 30, 2020		December 31, 2019
Oil and natural gas properties and equipment, at cost	$	8,554,349	$	8,532,196
Furniture, fixtures and other		20,387		20,317
Total property and equipment		8,574,736		8,552,513
Less: Accumulated depreciation, depletion and amortization		7,880,432		7,803,715
Oil and natural gas properties and other, net	$	694,304	$	748,798

Schedule of Other Assets, Noncurrent [Table Text Block]

	September 30, 2020		December 31, 2019
Right-of-Use assets (Note 7)	$	12,343	$	7,936
Unamortized debt issuance costs		2,386		3,798
Investment in White Cap, LLC		3,218		2,590
Unamortized brokerage fee for Monza		1,378		3,423
Proportional consolidation of Monza's other assets (Note 4)		1,625		5,308
Derivative assets		3,692		2,653
Appeal bond deposits		—		6,925
Other		996		814
Total other assets (long-term)	$	25,638	$	33,447

Schedule of Accrued Liabilities [Table Text Block]

	September 30, 2020		December 31, 2019
Accrued interest	$	25,421	$	10,180
Accrued salaries/payroll taxes/benefits		3,543		2,377
Incentive compensation plans		1,333		9,794
Litigation accruals		3,673		3,673
Lease liability (Note 7)		1,779		2,716
Derivatives - current		7,921		1,785
Other		790		371
Total accrued liabilities	$	44,460	$	30,896

Other Noncurrent Liabilities [Table Text Block]

	September 30, 2020		December 31, 2019
Dispute related to royalty deductions	$	4,687	$	4,687
Dispute related to royalty-in-kind		250		250
Derivatives		6,222		—
Lease liability (Note 7)		10,091		4,419
Black Elk escrow and other		12,013		632
Total other liabilities (long-term)	$	33,263	$	9,988