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Note 3 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Apr. 03, 2017
Accounts Receivable, Allowance for Credit Loss, Current	$ 100	$ 100
Tangible Asset Impairment Charges, Total	274	42,860
Other than Temporary Impairment Losses, Investments, Total	2,202	10,019
Impairment of Intangible Assets, Finite-lived		189
Number of Operating Segments	4
Goodwill, Impairment Loss	$ 0	0
Accrual for Environmental Loss Contingencies, Ending Balance	100	200
Income Tax Expense (Benefit), Total	$ 63	198
Blueknight Energy Partners GP LLC Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized \| shares	4.1
State and Local Jurisdiction [Member]
Income Tax Expense (Benefit), Total	$ 100	200
Advantage Pipeline LLC [Member]
Equity Method Investment, Ownership Percentage			30.00%
Customer Relationships [Member] \| Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Customer Relationships [Member] \| Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	20 years
Pipeline Systems [Member]
Tangible Asset Impairment Charges, Total		40,700
Pipeline Linefill [Member]
Tangible Asset Impairment Charges, Total		1,700
Truck Stations [Member]
Tangible Asset Impairment Charges, Total		400
Crude Oil Pipeline Services [Member] \| Customer Relationships [Member]
Impairment of Intangible Assets, Finite-lived		$ 200