XML 53 R42.htm IDEA: XBRL DOCUMENT v3.21.2

INVESTMENT IN MORION, INC. (Details) - Morion Inc [Member] - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
INVESTMENT IN MORION, INC. (Details) [Line Items]
Cost Method Investment Ownership Percentage	4.60%		4.60%
Investment Owned, at Cost	$ 800,000		$ 800,000
Related Party Transaction, Purchases from Related Party	$ 34,000	$ 118,000	120,000	$ 268,000
Proceeds from Dividends Received			$ 123,000	$ 105,000

X

- Definition

The percentage of ownership in the investee accounted for under the cost method of accounting.

+ References

No definition available.

+ Details

Name:	feim_CostMethodInvestmentOwnershipPercentage
Namespace Prefix:	feim_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	feim_INVESTMENTINMORIONINCDetailsLineItems
Namespace Prefix:	feim_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Cost of the investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

+ Details

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

X

- Definition

Dividends received on equity and other investments during the current period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 16
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3337-108585

+ Details

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

X

- Definition

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=feim_MorionIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: