Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Total revenue	$ 28,460	$ 27,075
Costs and expenses:
Operating expense	17,576	15,880
General and administrative expense	3,371	3,982
Loss on disposal of assets	24	0
Total costs and expenses	20,971	19,862
Operating income	7,489	7,213
Other income (expenses):
Other income	127	233
Interest expense	(964)	(1,333)
Income before income taxes	6,652	6,113
Provision for income taxes	10	10
Income from continuing operations	6,642	6,103
Income from discontinued operations, net	0	75,550
Net income	6,642	81,653
Allocation of net income for calculation of earnings per unit:
General partner interest in net income	105	1,292
Preferred interest in net income	6,150	6,341
Net income available to limited partners	$ 387	$ 74,020
Basic and diluted net income from discontinued operations per common unit (in dollars per share)	$ 0	$ 1.75
Basic and diluted net income (loss) from continuing operations per common unit (in dollars per share)	0.01	(0.01)
Basic and diluted net income per common unit (in dollars per share)	$ 0.01	$ 1.74
Weighted average common units outstanding - basic and diluted (in shares)	41,817	41,430
Third Party [Member]
Revenue from contracts	$ 7,606	$ 6,919
Lease revenue	8,487	8,303
Related Party [Member]
Revenue from contracts	5,121	4,849
Lease revenue	7,246	7,004
Service [Member] | Third Party [Member]
Revenue from contracts	7,606	6,919
Service [Member] | Related Party [Member]
Revenue from contracts	$ 5,121	$ 4,849