XML 59 R48.htm IDEA: XBRL DOCUMENT
v3.21.1

Note 8 - Concentrations of Credit Risk (Details Textual) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2021 USD ($) | Apr. 30, 2020 | Apr. 30, 2021 USD ($) | Apr. 30, 2020
Cash, Uninsured Amount | $ 13.4 |  | $ 13.4 |
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] |  |  |  |
Number of Customers | 2 | 2 | 2 | 3
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Two Distributors [Member] |  |  |  |
Number of Customers | 2 | 2 | 2 | 2
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Distributor One [Member] |  |  |  |
Concentration Risk, Percentage | 12.00% | 17.00% | 14.00% | 14.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Distributor Two [Member] |  |  |  |
Concentration Risk, Percentage | 11.00% | 11.00% | 11.00% | 11.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Wireless Carrier [Member] |  |  |  |
Number of Customers |  |  |  | 1
Concentration Risk, Percentage |  |  |  | 11.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Two Distributors [Member] |  |  |  |
Number of Customers | 2 | 2 | 2 | 2
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributor One [Member] |  |  |  |
Concentration Risk, Percentage |  |  | 14.00% | 19.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributor Two [Member] |  |  |  |
Concentration Risk, Percentage |  |  | 13.00% | 14.00%

X
- Definition Represents the number of customers. + References No definition available. + Details
Name: | rfil_NumberOfCustomers
Namespace Prefix: | rfil_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
Name: | us-gaap_CashUninsuredAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_RevenueFromContractWithCustomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=rfil_TwoDistributorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=rfil_DistributorOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=rfil_DistributorTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=rfil_WirelessCarrierMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |