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Note 11 - Contingencies (Details Textual)				2 Months Ended
	Jul. 05, 2022	Jun. 30, 2022	Nov. 04, 2021	Oct. 26, 2021
Violations of Federal Securities Laws [Member]
Loss Contingency, New Claims Filed, Number		1		4
Shareholder Derivative Actions [Member]
Loss Contingency, New Claims Filed, Number	3		4
Shareholder Derivative Actions, Texas Court [Member]
Loss Contingency, New Claims Filed, Number			2
Shareholder Derivative Actions, Texas State Court Member
Loss Contingency, New Claims Filed, Number			1
Shareholder Derivative Actions, Delaware Court [Member]
Loss Contingency, New Claims Filed, Number			1

X

- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-9

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_LitigationCaseAxis=sava_ViolationsOfFederalSecuritiesLawsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_LitigationCaseAxis=sava_ShareholderDerivativeActionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_LitigationCaseAxis=sava_ShareholderDerivativeActionsTexasCourtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_LitigationCaseAxis=sava_ShareholderDerivativeActionsTexasStateCourtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_LitigationCaseAxis=sava_ShareholderDerivativeActionsDelawareCourtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: