Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Current assets
Cash and cash equivalents	$ 30,344	$ 30,444
Accounts receivable, net	29,048	31,469
Other current assets, net	1,329	1,961
Total current assets	60,721	63,874
Land	24,008	24,008
Mineral rights, net	373,717	379,638
Intangible assets, net	12,381	12,924
Equity in unconsolidated investment	258,498	257,355
Long-term contract receivable, net	21,973	23,480
Other long-term assets, net	10,668	11,628
Total assets	761,966	772,907
Current liabilities
Accounts payable	930	909
Accrued liabilities	7,649	12,121
Accrued interest	169	302
Current portion of deferred revenue	4,667	4,341
Current portion of long-term debt, net	14,228	14,192
Total current liabilities	27,643	31,865
Deferred revenue	51,275	55,814
Long-term debt, net	87,112	127,876
Other non-current liabilities	5,491	6,244
Total liabilities	171,521	221,799
Commitments and contingencies (see Note 13)
Partners’ capital
Common unitholders’ interest (13,138,097 and 13,049,123 units issued and outstanding at June 30, 2025 and December 31, 2024, respectively)	579,773	543,231
General partner’s interest	10,496	9,547
Accumulated other comprehensive income (loss)	176	(1,670)
Total partners’ capital	590,445	551,108
Total liabilities and partners' capital	$ 761,966	$ 772,907