Note 11 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Accounts Payable, Current	$ 1,452		$ 1,992
Operating Costs and Expenses	7,163	$ 8,076
Accounts Receivable, after Allowance for Credit Loss, Current	$ 36,513		42,701
Director [Member] \| Corbin J Robertson Jr [Member] \| Great Northern Properties Limited Partnership [Member]
Equity Method Investment, Ownership Percentage	85.00%
Quintana Minerals Corp [Member] \| Affiliated Entity [Member] \| Related Party [Member]
Accounts Payable, Current	$ 400		400
Western Pocahontas Properties Limited Partnership [Member] \| Affiliated Entity [Member] \| Related Party [Member]
Accounts Payable, Current	800		1,000
Operating Costs and Expenses	2,000	$ 1,600
Great Northern Properties Limited Partnership [Member] \| Affiliated Entity [Member] \| Related Party [Member]
Accounts Receivable, after Allowance for Credit Loss, Current	$ 30		$ 30

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).

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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-Topic 310
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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
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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.

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