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Summary of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 USD ($) item shares | Jun. 30, 2021 shares | Jun. 30, 2022 USD ($) item segment | Dec. 31, 2021 USD ($)
Summary of Significant Accounting Policies |  |  |  |
Number Of Market Serving | item | 27 |  | 27 |
Number Of FM Radio Stations | item |  |  | 79 |
Number Of AM Radio Stations |  |  | 35 |
Number Of Metro Signals |  |  | 80 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares | 0 | 0 |  |
Debt securities, held to maturity | $ 10,000,000 |  | $ 10,000,000 |
Debt securities, held to maturity, fair value | 10,000,000 |  | 10,000,000 |
Marketable securities, current |  |  |  | $ 0
Allowance for doubtful accounts receivable | $ 359,000 |  | $ 359,000 | $ 469,000
Number of Radio Markets | item |  |  | 27 |
Number of operating segments | segment |  |  | 1 |
Number of reportable segments | segment |  |  | 1 |

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- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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