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Note 11 - Warrant Dividend Distribution - Changes in Warrants Outstanding and Warrant Liability (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Mar. 31, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Balance, shares (in shares)				16,895,000	0
Balance, liability				$ 113,363
Gain from change in fair value of warrant liabilities	$ 0	$ 65,142			$ 0	$ 108,183
Gain from change in fair value of warrant liabilities	$ 0	$ 65,142			$ 0	$ 108,183
Balance, shares (in shares)	0				0
Warrants to Purchase Common Stock [Member]
Balance, shares (in shares)		16,221,000			0
Balance, liability		$ 65,368			$ 0
Warrants exercised (in shares)		(3,152,000)	(674,000)	(674,000)
Warrants exercised		$ (226)		$ (4,954)
Gain from change in fair value of warrant liabilities		(65,142)		(43,041)
Gain from change in fair value of warrant liabilities		$ (65,142)		$ (43,041)
Redemption of common stock warrants (in shares)		(13,069,000)
Balance, shares (in shares)		0	16,221,000	16,221,000		0
Balance, liability	$ 0	$ 0	$ 65,368	$ 65,368	$ 0	$ 0

X

- Definition

Represents the warrants or rights exercised during the period.

+ References

No definition available.

+ Details

Name:	sava_ClassOfWarrantOrRightExercisedDuringPeriod
Namespace Prefix:	sava_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the warrants redeemed common stock warrants.

+ References

No definition available.

+ Details

Name:	sava_ClassOfWarrantsOrRightsCommonStockWarrantsRedeemed
Namespace Prefix:	sava_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of decrease in warrant liability from exercise of warrants.

+ References

No definition available.

+ Details

Name:	sava_ExerciseOfWarrantsResultingInDecreaseInWarrantLiability
Namespace Prefix:	sava_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

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

X

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

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

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=sava_WarrantsToPurchaseCommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: