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Note 11 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Accounts Payable, Current	$ 1,143		$ 1,143		$ 1,992
Operating Costs and Expenses	8,358	$ 7,898	23,451	$ 25,989
Quintana Minerals Corp [Member] | Affiliated Entity [Member]
Accounts Payable, Current	400		400		400
Western Pocahontas Properties Limited Partnership [Member] | Affiliated Entity [Member]
Accounts Payable, Current	300		300		$ 1,000
Operating Costs and Expenses	$ 1,100	$ 2,200	$ 5,100	$ 6,500

X

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481372/852-10-55-10

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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X

- Definition

Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense.

+ References

No definition available.

+ Details

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X

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X

- Details

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X

- Details

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Namespace Prefix:
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Period Type: