This elements represent the amount of monthly operating lease rent increase (decrease ) during the period.

No definition available.

Name:	rfil_IncreaseDecreaseInMonthlyOperatingLeaseRentExpenses
Namespace Prefix:	rfil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

It represents increase in area of land.

+ References

No definition available.

+ Details

Name:	rfil_IncreaseInAreaOfLand
Namespace Prefix:	rfil_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

Area of land held.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfLand
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

+ Details

Name:	us-gaap_DividendsPayableAmountPerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DividendsPayableDateOfRecordDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_StatementGeographicalAxis=rfil_SanDiegoCaliforniaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=rfil_NewYorkMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_CommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent events - Additional Information (Detail)			1 Months Ended
Subsequent events - Additional Information (Detail)	Jun. 09, 2017 $ / shares	Jun. 05, 2017 USD ($) ft²	Jan. 26, 2017 USD ($)	Apr. 30, 2014
San Diego, California [Member]
Subsequent Event [Line Items]
Lease Expiration Date			Jul. 31, 2022	Mar. 31, 2017
Increase Decrease In Monthly Operating Lease Rent Expenses			$ 2,596
San Diego, California [Member] \| Minimum [Member]
Subsequent Event [Line Items]
Operating Leases, Rent Expense			20,125
San Diego, California [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Operating Leases, Rent Expense			$ 22,721
Subsequent Event
Subsequent Event [Line Items]
Dividends payable, record date	Jun. 30, 2017
Dividends Payable, Amount Per Share \| $ / shares	$ 0.02
Increase in Area of Land \| ft²		2,321
Subsequent Event \| San Diego, California [Member]
Subsequent Event [Line Items]
Lease Expiration Date		Jul. 31, 2022
Increase Decrease In Monthly Operating Lease Rent Expenses		$ 2,692
Subsequent Event \| San Diego, California [Member] \| Minimum [Member]
Subsequent Event [Line Items]
Operating Leases, Rent Expense		$ 22,721
Area of Land \| ft²		19,587
Subsequent Event \| San Diego, California [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Operating Leases, Rent Expense		$ 25,413
Area of Land \| ft²		21,908
Subsequent Event \| New York [Member] \| Commitments [Member]
Subsequent Event [Line Items]
Lease Expiration Date	Jun. 30, 2018