Note 1 - Significant Accounting Policies (Tables)
|
12 Months Ended |
Dec. 31, 2020 |
|---|
| Notes Tables |
|
| Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
| |
|
Year Ended December 31, |
|
| |
|
2020 |
|
|
2019 |
|
|
2018 |
|
| Customer |
|
|
|
|
|
|
|
|
|
|
|
|
| BP Products North America |
|
|
39 |
% |
|
|
40 |
% |
|
|
20 |
% |
| Mercuria Energy America Inc. |
|
|
10 |
% |
|
|
** |
|
|
|
** |
|
| Shell Trading (US) Co./ Shell Energy N.A. |
|
|
** |
|
|
|
11 |
% |
|
|
30 |
% |
| Vitol Inc. |
|
|
** |
|
|
|
12 |
% |
|
|
14 |
% |
| Williams Field Services |
|
|
13 |
% |
|
|
** |
|
|
|
** |
|
|
| Accounts Receivable, Allowance for Credit Loss [Table Text Block] |
| |
|
2020 |
|
|
2019 |
|
|
2018 |
|
| Allowance for credit losses, beginning of period |
|
$ |
9,898 |
|
|
$ |
9,692 |
|
|
$ |
9,114 |
|
| Additional provisions for the year |
|
|
417 |
|
|
|
206 |
|
|
|
1,233 |
|
| Uncollectible accounts written off or collected |
|
|
(1,192 |
) |
|
|
— |
|
|
|
(655 |
) |
| Allowance for credit losses, end of period |
|
$ |
9,123 |
|
|
$ |
9,898 |
|
|
$ |
9,692 |
|
|
| Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] |
| |
|
December 31, |
|
| |
|
2020 |
|
|
2019 |
|
| Derivatives – current (1) |
|
$ |
2,752 |
|
|
$ |
7,266 |
|
| Unamortized bonds/insurance premiums |
|
|
4,717 |
|
|
|
4,357 |
|
| Prepaid deposits related to royalties |
|
|
4,473 |
|
|
|
7,980 |
|
| Prepayment to vendors |
|
|
1,429 |
|
|
|
10,202 |
|
| Other |
|
|
461 |
|
|
|
886 |
|
| Prepaid expenses and other assets |
|
$ |
13,832 |
|
|
$ |
30,691 |
|
|
| Property, Plant and Equipment [Table Text Block] |
| |
|
December 31, |
|
| |
|
2020 |
|
|
2019 |
|
| Oil and natural gas properties and equipment |
|
$ |
8,567,509 |
|
|
$ |
8,532,196 |
|
| Furniture, fixtures and other |
|
|
20,847 |
|
|
|
20,317 |
|
| Total property and equipment |
|
|
8,588,356 |
|
|
|
8,552,513 |
|
| Less accumulated depreciation, depletion and amortization |
|
|
7,901,478 |
|
|
|
7,803,715 |
|
| Oil and natural gas properties and other, net |
|
$ |
686,878 |
|
|
$ |
748,798 |
|
|
| Schedule of Other Assets, Noncurrent [Table Text Block] |
| |
|
December 31, |
|
| |
|
2020 |
|
|
2019 |
|
| ROU assets (Note 7) |
|
$ |
11,509 |
|
|
$ |
7,936 |
|
| Unamortized debt issuance costs |
|
|
2,094 |
|
|
|
3,798 |
|
| Investment in White Cap, LLC |
|
|
2,699 |
|
|
|
2,590 |
|
| Derivatives |
|
|
2,762 |
|
|
|
2,653 |
|
| Unamortized brokerage fee for Monza |
|
|
626 |
|
|
|
3,423 |
|
| Proportional consolidation of Monza's other assets (Note 4) |
|
|
1,782 |
|
|
|
5,308 |
|
| Appeal bond deposits |
|
|
— |
|
|
|
6,925 |
|
| Other |
|
|
998 |
|
|
|
814 |
|
| Total other assets |
|
$ |
22,470 |
|
|
$ |
33,447 |
|
|
| Schedule of Accrued Liabilities [Table Text Block] |
| |
|
December 31, |
|
| |
|
2020 |
|
|
2019 |
|
| Accrued interest |
|
$ |
10,389 |
|
|
$ |
10,180 |
|
| Accrued salaries/payroll taxes/benefits |
|
|
4,009 |
|
|
|
2,377 |
|
| Incentive compensation plans |
|
|
— |
|
|
|
9,794 |
|
| Litigation accruals |
|
|
436 |
|
|
|
3,673 |
|
| Lease liability (Note 7) |
|
|
394 |
|
|
|
2,716 |
|
| Derivatives |
|
|
13,620 |
|
|
|
1,785 |
|
| Other |
|
|
1,032 |
|
|
|
371 |
|
| Total accrued liabilities |
|
$ |
29,880 |
|
|
$ |
30,896 |
|
|
| Other Noncurrent Liabilities [Table Text Block] |
| |
|
December 31, |
|
| |
|
2020 |
|
|
2019 |
|
| Dispute related to royalty deductions |
|
$ |
5,467 |
|
|
$ |
4,687 |
|
| Dispute related to royalty-in-kind |
|
|
— |
|
|
|
250 |
|
| Lease liability (Note 7) |
|
|
11,360 |
|
|
|
4,419 |
|
| Derivatives |
|
|
4,384 |
|
|
|
— |
|
| Black Elk escrow |
|
|
11,103 |
|
|
|
— |
|
| Other |
|
|
624 |
|
|
|
632 |
|
| Total other liabilities (long-term) |
|
$ |
32,938 |
|
|
$ |
9,988 |
|
|