Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 671	$ 558
Accounts receivable, net	19,515	23,716
Receivables from related parties, net	942	1,110
Other current assets	8,723	8,692
Total current assets	29,851	34,076
Property, plant and equipment, net of accumulated depreciation of $274,404 and $279,144 at December 31, 2019, and March 31, 2020, respectively	226,398	232,777
Goodwill	6,728	6,728
Debt issuance costs, net	2,093	2,344
Operating lease assets	10,349	10,758
Intangible assets, net	13,402	14,088
Other noncurrent assets	1,251	1,169
Total assets	290,072	301,940
Current liabilities:
Accounts payable	3,992	3,125
Accounts payable to related parties	2,907	2,460
Contingent liability with related party (Note 8)		12,221
Accrued interest payable	301	293
Accrued property taxes payable	2,866	3,247
Accrued payroll	2,495	4,823
Current operating lease liability	2,324	2,391
Other current liabilities	3,698	2,627
Total current liabilities	35,421	54,576
Other long-term liabilities	2,362	2,417
Noncurrent operating lease liability	8,147	8,529
Long-term debt	271,592	255,592
Commitments and contingencies (Note 12)
Partners’ capital(deficit):
Common unitholders (40,830,051 and 41,034,763 units issued and outstanding at December 31, 2019, and March 31, 2020, respectively)	348,984	356,777
Preferred Units (35,125,202 units issued and outstanding at both dates)	253,923	253,923
General partner interest (1.6% interest with 1,225,409 general partner units outstanding at both dates)	(632,149)	(632,023)
Total partners’ deficit	(29,242)	(21,323)
Total liabilities and partners’ deficit	290,072	301,940
Third Party [Member]
Current liabilities:
Accrued crude oil purchases	3,240	6,706
Unearned revenue	3,248	1,942
Related Party [Member]
Current liabilities:
Accrued crude oil purchases	7,344	11,807
Unearned revenue	3,006	2,934
Long-term unearned revenue with related parties	$ 1,792	$ 2,149