The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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

- 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

- Definition

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

+ References

+ Details

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

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=edsa_RangeOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=edsa_RangeTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=edsa_RangeThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=edsa_RangeFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=edsa_RangeFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=edsa_RangeSixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 7 - Capital Shares - Options Outstanding and Exercisable (Details)	12 Months Ended
	Sep. 30, 2025 $ / shares shares	Sep. 30, 2024 $ / shares shares	Sep. 30, 2023 $ / shares shares	Sep. 30, 2022 $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	378,039	378,039	383,040	420,615
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number	360,159
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price \| $ / shares		$ 24.7	$ 24.93	$ 25.6
Range One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	37,719
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number	37,719
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price \| $ / shares	$ 15.12
Range Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	43,031
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number	43,031
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price \| $ / shares	$ 22.12
Range Three [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	51,006
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number	51,006
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit \| $ / shares	$ 52.08
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit \| $ / shares	$ 56.49
Range Four [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	79,651
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number	79,651
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit \| $ / shares	$ 36.75
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit \| $ / shares	$ 40.18
Range Five [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	56,865
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number	56,865
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price \| $ / shares	$ 25.97
Range Six [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	109,767
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number	91,887
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit \| $ / shares	$ 4.1
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit \| $ / shares	$ 10.01