Note D - Debt (Details Textual) - VeraBank [Member] - Revolving Credit Facility [Member]	Dec. 12, 2018 USD ($)	Sep. 30, 2019 USD ($)
Line of Credit Facility, Maximum Borrowing Capacity	$ 5,000,000	$ 4,988,000
Line of Credit Facility, Interest Rate at Period End		4.45%
Debt Instrument, Borrowing Base, Percent of Accounts Receivable	80.00%
Debt Instrument, Borrowing Base, Percent of Inventory	40.00%
Debt Instrument, Borrowing Base, Maximum Threshold of Inventory	$ 3,000,000
Debt Instrument, Minimum Threshold of Shareholders' Equity	$ 50,000,000
Debt Instrument, Debt to Shareholders' Equity Maximum Threshold, Percent	50.00%
Debt Instrument, Debt Service Coverage Ratio, Minimum Threshold	2
Long-term Line of Credit, Total		$ 0
Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	(0.55%)

Represents the borrowing base not exceeding the maximum amount of inventory.

No definition available.

Name:	frd_DebtInstrumentBorrowingBaseMaximumThresholdOfInventory
Namespace Prefix:	frd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the borrowing base as a percentage of accounts receivable under a debt agreement.

+ References

No definition available.

+ Details

Name:	frd_DebtInstrumentBorrowingBasePercentOfAccountsReceivable
Namespace Prefix:	frd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the borrowing base as a percentage of inventory under a debt agreement.

+ References

No definition available.

+ Details

Name:	frd_DebtInstrumentBorrowingBasePercentOfInventory
Namespace Prefix:	frd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The minimum debt service coverage ratio that may be allowed under debt covenants.

+ References

No definition available.

+ Details

Name:	frd_DebtInstrumentDebtServiceCoverageRatioMinimumThreshold
Namespace Prefix:	frd_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum amount of debt to shareholders' equity that may be allowed, as a percentage, under certain debt covenants.

+ References

No definition available.

+ Details

Name:	frd_DebtInstrumentDebtToShareholdersEquityMaximumThresholdPercent
Namespace Prefix:	frd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The minimum amount of tangible common shareholders' equity that may be allowed under certain debt covenants.

+ References

No definition available.

+ Details

Name:	frd_DebtInstrumentMinimumThresholdOfShareholdersEquity
Namespace Prefix:	frd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ Details

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

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=frd_VeraBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: