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v3.23.1

The following summary reflects stock option activity and related information: (Details) - $ / shares |  | 12 Months Ended
--- | --- | ---
Aug. 27, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Share-Based Payment Arrangement [Abstract] |  |  |
Outstanding at beginning |  | 2,440,700 | 2,500,000
Weighted average exercise price beginning |  |  | $ 1.36
Granted | 187,500 | 249,000 | 187,500
Exercise Price granted |  | $ 11.80 | $ 12.20
Expired |  |  | (246,800)
Cancelled or Exercised |  |  | $ 1.36
Weighted average exercise price beginning |  | $ 2.19 |
Exercised |  | (310,000) |
Exercised |  | $ 1.34 |
Outstanding at ending |  | 2,379,700 | 2,440,700
Weighted average exercise price ending |  | $ 3.31 | $ 2.19

X
- Definition The element represents options granted. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition The element represents outstanding at beginning. + References No definition available. + Details
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Namespace Prefix: | empr_
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Balance Type: | na
Period Type: | instant

X
- Definition The element represents share based compensation arrangements by share based payment award options granted in period weighted average exercise price. + References No definition available. + Details
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Namespace Prefix: | empr_
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X
- Definition The element represents share based compensation arrangements by share based payment award options granted in period weighted average expired price. + References No definition available. + Details
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Namespace Prefix: | empr_
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- Definition The element represents stock issued during period shares stock options expired. + References No definition available. + Details
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Balance Type: | na
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- Definition The element represents weighted average exercise price beginning. + References No definition available. + Details
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Balance Type: | na
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Namespace Prefix: | empr_
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Balance Type: | na
Period Type: | duration

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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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