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Note 4 - Related Party Transactions (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Related Party Transactions [Table Text Block] |
|  | In Thousands |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Net profits interest receivable |  | $ | 7,170 |  |  | $ | 6,822 |  |  | $ | 1,914 |
Net profits interests revenue |  | $ | 28,207 |  |  | $ | 17,596 |  |  | $ | 8,714 |
General and administrative amounts payable |  | $ | 68 |  |  | $ | 85 |  |  | $ | 486 |
Total general and administrative expenses |  | $ | 3,399 |  |  | $ | 571 |  |  | $ | 2,905 |

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
Name: | us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration