Note 3 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands, shares in Millions	12 Months Ended
Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 0	$ 0
Impairment of Intangible Assets (Excluding Goodwill), Total	$ 0	0
Number of Reporting Units	1
Goodwill, Impairment Loss	$ 0	0
Accrual for Environmental Loss Contingencies, Ending Balance	$ 0	$ 0
Blueknight Energy Partners GP LLC Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) \| shares	8.1
Maximum [Member]
Lessee, Operating Lease, Term of Contract (Year)	25 years
Customer Relationships [Member] \| Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Customer Relationships [Member] \| Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	10 years

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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