Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 10,990	$ 11,989
Accounts receivable, net	33,874	41,086
Other current assets, net	3,494	2,218
Total current assets	48,358	55,293
Land	24,008	24,008
Mineral rights, net	390,176	394,483
Intangible assets, net	13,340	13,682
Equity in unconsolidated investment	268,634	276,549
Long-term contract receivable, net	25,632	26,321
Other Assets, Noncurrent	8,034	7,540
Total assets	778,182	797,876
Current liabilities
Accounts payable	1,514	885
Accrued liabilities	5,064	12,987
Accrued interest	995	584
Current portion of deferred revenue	5,635	4,599
Current portion of long-term debt, net	14,202	30,785
Total current liabilities	27,410	49,840
Deferred revenue	38,348	38,356
Long-term debt, net	174,595	124,273
Other Liabilities, Noncurrent	6,305	7,172
Total liabilities	246,658	219,641
Commitments and contingencies (see Note 13)
Class A Convertible Preferred Units (71,666 issued and outstanding at March 31, 2024 and December 31, 2023 at $1,000 par value per unit; liquidation preference of $1,850 per unit at March 31, 2024 and December 31, 2023) (See Note 3)	47,181	47,181
Partners’ capital
Common unitholders’ interest (12,960,064 and 12,634,642 units issued and outstanding at March 31, 2024 and December 31, 2023, respectively)	474,095	503,076
General partner’s interest	7,721	8,005
Warrants and Rights Outstanding	4,804	23,095
Accumulated other comprehensive loss	(2,277)	(3,122)
Total partners’ capital	484,343	531,054
Total liabilities and partners' capital	$ 778,182	$ 797,876