XML 71 R59.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Common Stock - (Narrative) (Details) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 07, 2023 $ / shares | Nov. 16, 2023 $ / shares | Sep. 27, 2023 $ / shares | May 09, 2023 $ / shares | Mar. 01, 2023 $ / shares | Dec. 07, 2022 $ / shares | Sep. 20, 2022 $ / shares | Aug. 19, 2022 item director shares | Dec. 14, 2021 $ / shares | Dec. 31, 2023 USD ($) item director $ / shares shares | Dec. 31, 2022 $ / shares shares | Dec. 31, 2021 $ / shares
Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of votes per share of common stock |  |  |  |  |  |  |  |  |  | 1 |  |
Dividends declared per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 3.00 | $ 4.86 | $ 0.98
Number of board of directors | director |  |  |  |  |  |  |  |  |  | 8 |  |
Former Shareholder |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of votes per share of common stock |  |  |  |  |  |  |  | 10 |  |  |  |
Dividends declared per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0 |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of votes per share of common stock |  |  |  |  |  |  |  |  |  | 1 |  |
Common stock, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  | 8,007,000 | 7,867,000 |
Dividends declared per share (in dollars per share) | $ / shares | $ 2.00 | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.25 |  | $ 0.16 |  |  |
Percentage of directors to be elected |  |  |  |  |  |  |  |  |  | 25.00% |  |
Stock repurchase program, remaining authorization amount | $ |  |  |  |  |  |  |  |  |  | $ 18.0 |  |
Class A Common Stock | Former Shareholder |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of directors elected | director |  |  |  |  |  |  |  | 2 |  |  |  |
Estate Ownership Percentage |  |  |  |  |  |  |  | 16.00% |  |  |  |
Class B Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of votes per share of common stock |  |  |  |  |  |  |  |  |  | 10 |  |
Common stock, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  | 0 | 0 |
Dividends declared per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.16 |  |  |
Class B Common Stock | Former Shareholder |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of votes per share of common stock |  |  |  |  |  |  |  | 1 |  |  |  |
Common stock, shares issued (in shares) | shares |  |  |  |  |  |  |  | 0 |  |  |  |
Common stock, shares outstanding (in shares) | shares |  |  |  |  |  |  |  | 0 |  |  |  |

X
- References No definition available. + Details
Name: | sga_CommonStockLineItems
Namespace Prefix: | sga_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of Board of Directors. + References No definition available. + Details
Name: | sga_NumberOfBoardOfDirectors
Namespace Prefix: | sga_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of directors elected. + References No definition available. + Details
Name: | sga_NumberOfDirectorsElected
Namespace Prefix: | sga_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of votes per share. + References No definition available. + Details
Name: | sga_NumberOfVotesPerShare
Namespace Prefix: | sga_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percent of common stock outstanding in estate planning trust of former chief executive officer. + References No definition available. + Details
Name: | sga_PercentOfCommonStockOutstandingInEstatePlanningTrustOfFormerChiefExecutiveOfficer
Namespace Prefix: | sga_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of directors to be elected. + References No definition available. + Details
Name: | sga_PercentageOfDirectorsToBeElected
Namespace Prefix: | sga_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 + Details
Name: | us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CommonStockSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.6-05(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(4)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(16)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(7)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CommonStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_TitleOfIndividualAxis=sga_FormerShareholderMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |