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Note 2 - Revenues From Contracts With Customers (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue from Contract with Customer, Excluding Assessed Tax $ 68,533 $ 81,379 $ 205,811 $ 231,795
Mineral Rights Segment [Member] | Transportation and Processing Services [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 3,900 4,900 9,500 12,900
Sales-type Lease, Revenue $ 600 $ 1,100 $ 1,900 $ 2,500