Debt, Financings Committed Under Sale and Leaseback Agreements (Details) $ in Thousands	12 Months Ended
Dec. 31, 2025 USD ($)
New Huarong Facility [Member]
Debt [Abstract]
Maximum leverage ratio	85.00%
Asset cover ratio	117.60%
Minimum term of time charter assigned as security	12 months
New Huarong Facility [Member] \| M/T Eco West Coast [Member]
Debt [Abstract]
Minimum free liquidity	$ 400
New Huarong Facility [Member] \| M/T Eco Malibu [Member]
Debt [Abstract]
Minimum free liquidity	$ 500
Huarong Facility [Member]
Debt [Abstract]
Maximum ratio of debt to market value of fleet	75.00%
Minimum free liquidity per delivered vessel	$ 500
Asset cover ratio	120.00%
Minimum term of time charter assigned as security	12 months
AVIC Facility [Member]
Debt [Abstract]
Maximum ratio of debt to market value of fleet	75.00%
Minimum free liquidity per delivered vessel	$ 500
Asset cover ratio	120.00%
Minimum term of time charter assigned as security	12 months

Financial ratio that measures the required cover of outstanding debt to the value of the financed asset.

No definition available.

Name:	rubi_AssetCoverageRatio
Namespace Prefix:	rubi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum ratio of total net debt to the aggregate market value of the Company's fleet, current or future.

+ References

No definition available.

+ Details

Name:	rubi_DebtInstrumentMaximumRatioOfTotalNetDebtToMarketValueOfFleet
Namespace Prefix:	rubi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum amount of free liquidity as defined in the sale and leaseback agreement.

+ References

No definition available.

+ Details

Name:	rubi_DebtInstrumentMinimumFreeLiquidity
Namespace Prefix:	rubi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The minimum amount of free liquidity per delivered vessel owned/operated by the Company.

+ References

No definition available.

+ Details

Name:	rubi_DebtInstrumentMinimumFreeLiquidityPerDeliveredVessel
Namespace Prefix:	rubi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Minimum term of time charter assigned as security under the debt instrument, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	rubi_DebtInstrumentMinimumTermOfTimeCharterAssignedAsSecurity
Namespace Prefix:	rubi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

A financial metric used to evaluate a company's debt levels and its ability to meet its financial obligations.

+ References

No definition available.

+ Details

Name:	rubi_MaximumLeverageRatio
Namespace Prefix:	rubi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=rubi_NewHuarongFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=rubi_MTEcoWestCoastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=rubi_MTEcoMalibuMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rubi_HuarongFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rubi_AVICFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: