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v3.23.3

Summary of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2023 USD ($) item shares | Sep. 30, 2022 shares | Sep. 30, 2023 USD ($) item segment shares | Sep. 30, 2022 shares | Dec. 31, 2022 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of market serving | item | 27 |  | 27 |  |
Number of FM radio stations | item |  |  | 79 |  |
Number of AM radio stations |  |  | 33 |  |
Number of metro signals |  |  | 80 |  |
Antidilutive securities excluded from computation of earnings per share, amount | shares | 0 | 0 | 0 | 0 |
Debt securities, held to maturity | $ | $ 10,500,000 |  | $ 10,500,000 |  | $ 10,100,000
Securities at fair value | $ | 10,500,000 |  | 10,500,000 |  | 10,000,000.0
Allowance for doubtful accounts receivable | $ | $ 497,000 |  | $ 497,000 |  | $ 519,000
Number of Radio Markets | item |  |  | 27 |  |
Number of operating segments | segment |  |  | 1 |  |
Number of reportable segments | segment |  |  | 1 |  |

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