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

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

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_StatementScenarioAxis=us-gaap_ScenarioForecastMember
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:

Subsequent events - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 26, 2017	Oct. 31, 2016	Dec. 08, 2016
San Diego, California [Member]
Subsequent Event [Line Items]
Lease Expiration Date		Mar. 31, 2017
San Diego, California [Member] \| Scenario, Forecast [Member]
Subsequent Event [Line Items]
Lease Expiration Date	Jul. 31, 2022
Increase Decrease In Monthly Operating Lease Rent Expenses	$ 2,596
San Diego, California [Member] \| Minimum [Member] \| Scenario, Forecast [Member]
Subsequent Event [Line Items]
Operating Leases, Rent Expense	20,125
San Diego, California [Member] \| Maximum [Member] \| Scenario, Forecast [Member]
Subsequent Event [Line Items]
Operating Leases, Rent Expense	$ 22,721
Subsequent Event
Subsequent Event [Line Items]
Dividends Payable, Amount Per Share			$ 0.02