XML 59 R49.htm IDEA: XBRL DOCUMENT v3.23.1

The following summary reflects stock option activity and related information: (Details)	3 Months Ended
	Mar. 31, 2023 $ / shares shares
Share-Based Payment Arrangement [Abstract]
Outstanding at beginning | shares	2,379,700
Weighted average exercise price beginning | $ / shares	$ 3.31
Granted | shares
Granted | $ / shares
Cancelled | shares	(373,234)
Cancelled | $ / shares	$ 3.29
Outstanding at ending | shares	2,006,466
Weighted average exercise price ending | $ / shares	$ 2.91

X

- Definition

The element represents options cancelled.

+ References

No definition available.

+ Details

Name:	empr_OptionsCancelled
Namespace Prefix:	empr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The element represents options granted.

+ References

No definition available.

+ Details

Name:	empr_OptionsGranted
Namespace Prefix:	empr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The element represents outstanding at beginning.

+ References

No definition available.

+ Details

Name:	empr_OutstandingAtBeginning
Namespace Prefix:	empr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The element represents weighted average exercise price beginning.

+ References

No definition available.

+ Details

Name:	empr_WeightedAverageExercisePriceBeginning
Namespace Prefix:	empr_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The element represents weighted average exercise price cancelled.

+ References

No definition available.

+ Details

Name:	empr_WeightedAverageExercisePriceCancelled
Namespace Prefix:	empr_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The element represents weighted average exercise pricegranted.

+ References

No definition available.

+ Details

Name:	empr_WeightedAverageExercisePricegranted
Namespace Prefix:	empr_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant