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Note 4 - Real Property and Other Income, Expense (Details Textual) - Office Building [Member] - TEXAS - ft² | Sep. 30, 2024 | Aug. 04, 2021
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Net Rentable Area (Square Foot) |  | 90,000
Percentage of Occupancy | 25.00% |

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: |