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Note 4 - Real Property (Details Textual) - Office Building [Member] - TEXAS	Sep. 30, 2023 ft²
Net Rentable Area (Square Foot)	90,000
Percentage of Currently Leased	60.00%
Percentage of Occupancy	25.00%

X

- Definition

Percentage of currently leased.

+ References

No definition available.

+ Details

Name:	sava_PercentageOfCurrentlyLeased
Namespace Prefix:	sava_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of occupancy.

+ References

No definition available.

+ Details

Name:	sava_PercentageOfOccupancy
Namespace Prefix:	sava_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Net rentable area for properties owned.

+ References

No definition available.

+ Details

Name:	us-gaap_NetRentableArea
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_OfficeBuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_TX
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: