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Note 3 - Revenue From Contracts With Customers - Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounts payable $ 909 $ 885  
Current portion of deferred revenue 4,341 4,599  
Deferred revenue 55,814 38,356  
Balance 42,955 46,437 $ 61,862
Increase due to minimums and lease amendment fees 32,960 17,526 19,073
Recognition of previously deferred revenue (15,760) (21,008) (34,498)
Balance 60,155 42,955 $ 46,437
Coal Royalty Revenues [Member]      
Accounts payable [1] 125 0  
Current portion of deferred revenue 4,341 4,599  
Deferred revenue 55,814 38,356  
Coal Royalty Revenues [Member] | Accounts Receivable [Member]      
Contract with customer, current 27,358 37,206  
Coal Royalty Revenues [Member] | Other Current Assets [Member]      
Contract with customer, current [2] 0 429  
Coal Royalty Revenues [Member] | Other Long Term Assets [Member]      
Contract with customer, noncurrent [3] $ 2,352 $ 0  
[1] Accounts payable include override payments owed by NRP from contracts with customers.
[2] Other current assets, net includes short-term notes receivables from contracts with customers.
[3] Other long-term assets, net includes amounts prepaid by NRP related to override agreements from contracts with customers as well as long-term lease amendment fee receivables from contracts with customers.