This item represents the fair value of cost of debt and equity securities, Excluding Interest Only Securities

No definition available.

Name:	oaks_AvailableForSaleSecuritiesAmortizedCostFaceValueExcludingInterestOnlySecurities
Namespace Prefix:	oaks_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Available For Sale Securities, Number Sold

+ References

No definition available.

+ Details

Name:	oaks_AvailableForSaleSecuritiesNumberSold
Namespace Prefix:	oaks_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Management Fee Expense, Amount Waived

+ References

No definition available.

+ Details

Name:	oaks_ManagementFeeExpenseAmountWaived
Namespace Prefix:	oaks_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The element represent the percentage of management fee during the period.

+ References

No definition available.

+ Details

Name:	oaks_ManagementFeePercentage
Namespace Prefix:	oaks_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Management Fee Percentage, Waived Portion

+ References

No definition available.

+ Details

Name:	oaks_ManagementFeePercentageWaivedPortion
Namespace Prefix:	oaks_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The element represents the percentage of shares that will be issued under the plan.

+ References

No definition available.

+ Details

Name:	oaks_PercentageOfSharesIssued
Namespace Prefix:	oaks_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Reimbursable Costs Payable

+ References

No definition available.

+ Details

Name:	oaks_ReimbursableCostsPayable
Namespace Prefix:	oaks_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Cost associated with reimbursable income. This occurs when a services entity incurs expenses on behalf of the client and passes through the cost of reimbursable expenses to a client.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_CostOfReimbursableExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_ManagementFeeExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying amount of the unpaid portion of the fee payable to the managing member or general partner for management of the fund or trust.

+ References

No definition available.

+ Details

Name:	us-gaap_ManagementFeePayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of cash outflow for fees classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585

+ Details

Name:	us-gaap_PaymentsForFees
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Cash received for fees during the current period. This element excludes cash proceeds from license fees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585

+ Details

Name:	us-gaap_ProceedsFromFeesReceived
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from sale proceeds and collection of repayments from borrowers on loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization; includes mortgages and other types of loans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4600-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3461-108585

+ Details

Name:	us-gaap_ProceedsFromSaleAndCollectionOfLoansHeldforsale
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=oaks_ManagerEquityPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=oaks_LoanReviewServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=oaks_MaxexLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=oaks_ResidentialMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_AffiliatedEntityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=oaks_ClassA4WarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

RELATED PARTY TRANSACTIONS - Narrative (Details)		1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
RELATED PARTY TRANSACTIONS - Narrative (Details)	Jun. 07, 2017	Jan. 18, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) security	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Apr. 30, 2018 shares
Related Party Transaction [Line Items]
Management fee percentage			1.50%
Management fee percentage, waived portion	0.75%
Management fee waived		$ 6,959				$ 6,959	$ 79,415
Management fee				$ 604,191	$ 552,882	1,180,326	1,097,392	$ 1,180,330
Management fee payable			$ 188,000	593,000	188,000	593,000	188,000
Reimbursable expenses				570,833	961,909	1,316,925	2,170,852
Reimbursable expenses payable			375,000	592,500	375,000	592,500	375,000
Notional amount								1,281,829,317
Restricted Stock Units (RSUs)
Related Party Transaction [Line Items]
Compensation expense						$ 9,662	6,624
Manager Equity Plan
Related Party Transaction [Line Items]
Maximum shares issued, percentage of issued and outstanding shares of common stock						3.00%
Manager Equity Plan \| Restricted Stock Units (RSUs)
Related Party Transaction [Line Items]
Unrecognized compensation expense			$ 10,010	$ 9,823	$ 10,010	$ 9,823	10,010
Weighted average period for compensation expense not yet recognized						6 years 8 months 12 days
Lead independent director \| Loan Review Services
Related Party Transaction [Line Items]
Proceeds from fees							20,000
Lead independent director \| MAXEX LLC \| Residential Mortgage Loans
Related Party Transaction [Line Items]
Proceeds from sale of loans								$ 24,600,000
Lead independent director \| MAXEX LLC \| Loan Review Services
Related Party Transaction [Line Items]
Proceeds from fees						$ 148,221	9,325
Marketing fees paid						34,573	$ 2,175
Affiliate of manager
Related Party Transaction [Line Items]
Number of available for sale sold \| security				4
Notional amount				$ 82,900,000		$ 82,900,000
Class A-4 warrant \| Lead independent director \| MAXEX LLC
Related Party Transaction [Line Items]
Number of securities called by warrants (in warrants) \| shares									35,658