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Note 12 - Contingencies (Details Textual) $ in Millions						1 Months Ended	2 Months Ended	20 Months Ended
	Sep. 06, 2024	Aug. 06, 2024	Mar. 18, 2024	Jul. 05, 2022	Jun. 30, 2022	Feb. 28, 2025 USD ($)	Oct. 26, 2021	Jun. 20, 2023	Jun. 20, 2023
Violations of Federal Securities Laws [Member]
Loss Contingency, New Claims Filed, Number					1		4
Shareholder Derivative Actions, Texas Court [Member]
Loss Contingency, New Claims Filed, Number								2	4
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
Shareholder Derivative Actions [Member]
Loss Contingency, New Claims Filed, Number	2		2	3
Shareholder Derivative Actions [Member] | Subsequent Event [Member]
Legal Fees						$ 1
Anti-SLAPP Lawsuit [Member]
Number of Former Employees		2

X

- Definition

Represents the number of former employees.

+ References

No definition available.

+ Details

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Namespace Prefix:	sava_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(6))
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

+ Details

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

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

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X

- Details

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Namespace Prefix:
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- Details

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X

- Details

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- Details

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- Details

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