Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues
Total revenues	$ 19,100	$ 20,406
Operating expenses
Operations and maintenance (excluding depreciation and amortization reflected below)	5,565	5,754
General and administrative	1,185	1,201
Depreciation and amortization	898	887
Total operating expenses	7,648	7,842
Operating income	11,452	12,564
Interest expense	(1,239)	(1,928)
Income before income taxes and income from equity method investee	10,213	10,636
Income tax expense	(38)	(84)
Income from equity method investee	175	175
Net income	10,350	10,727
Affiliate [Member]
Revenues
Total revenues	18,095	19,309
Non-affiliate [Member]
Revenues
Total revenues	1,005	1,097
General Partner [Member]
Operating expenses
Net income	207	215
Limited Partners [Member] | Common Units [Member]
Operating expenses
Net income	$ 10,143	$ 10,512
Earnings per limited partner unit (basic and diluted):
Common units	$ 0.44	$ 0.45
Weighted average limited partner units outstanding (basic and diluted):
Common units	23,208	23,161