Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 2,777	$ 1,455
Accounts receivable, net	25,913	35,683
Receivables from related parties, net	1,873	1,043
Other current assets	7,774	9,345
Total current assets	38,337	47,526
Property, plant and equipment, net of accumulated depreciation of $263,554 and $278,768 at December 31, 2018, and September 30, 2019, respectively	238,818	248,261
Goodwill	6,728	6,728
Debt issuance costs, net	2,595	3,349
Operating lease assets	11,374
Intangible assets, net	14,775	16,834
Other noncurrent assets	1,348	606
Total assets	313,975	323,304
Current liabilities:
Accounts payable	4,036	3,707
Accounts payable to related parties	3,306	2,263
Accrued interest payable	289	465
Accrued property taxes payable	3,701	3,089
Accrued payroll	3,836	3,667
Current operating lease liability	2,479
Other current liabilities	3,352	3,465
Total current liabilities	47,002	48,865
Other long-term liabilities	3,708	4,010
Noncurrent operating lease liability	8,968
Contingent liability with related party (Note 9)	12,061	10,019
Long-term debt	258,592	265,592
Commitments and contingencies (Note 15)
Partners’ capital:
Common unitholders (40,424,372 and 40,813,488 units issued and outstanding at December 31, 2018, and September 30, 2019, respectively)	360,144	370,972
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)	(631,968)	(631,791)
Total partners’ deficit	(17,901)	(6,896)
Total liabilities and partners’ deficit	313,975	323,304
Third Party [Member]
Current liabilities:
Accrued crude oil purchases	6,465	13,949
Unearned revenue	5,476	3,206
Related Party [Member]
Current liabilities:
Accrued crude oil purchases	11,438	10,219
Unearned revenue	2,624	4,835
Long-term unearned revenue with related parties	$ 1,545	$ 1,714