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Note 5 - Shareholders' Equity - Number of Shares to be Purchased Per Stock Purchase Contract (Details) - Common Stock [Member] - Parent Company [Member] - $ / shares | Mar. 01, 2024 | Feb. 28, 2021
--- | --- | ---
Forecast [Member] |  |
Less than $78.6906, but greater than $64.24 (in dollars per share) | $ 50.00 |
Minimum [Member] |  |
Equal to or greater than $78.6906 (“threshold appreciation price”) (in shares) |  | 0.6354
Minimum [Member] | Forecast [Member] |  |
Equal to or greater than $78.6906 (“threshold appreciation price”) (in shares) | 0.6354 |
Maximum [Member] | Forecast [Member] |  |
Equal to or greater than $78.6906 (“threshold appreciation price”) (in shares) | 0.7783 |

X
- Definition Number of shares to be purchased per stock purchase contract as settlement rate. + References No definition available. + Details
Name: | sr_NumberOfSharesToBePurchasedPerStockPurchaseContractSettlementRate
Namespace Prefix: | sr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents price divided by applicable market value to determine number of shares per stock purchase contract. + References No definition available. + Details
Name: | sr_PriceDividedByApplicableMarketValueToDetermineNumberOfSharesPerStockPurchaseContract
Namespace Prefix: | sr_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |