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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) Rate | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Feb. 23, 2023 USD ($)
Number of Television Markets | 113 |  |  |
Percent of US Television Households Reached (Rate) | Rate | 36.00% |  |  |
Number of Television Markets with Top-Rated Stations | 79 |  |  |
Number of Television Markets with First and/or Second Rated Stations | 102 |  |  |
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount | $ 29,000 | $ 18,000 | $ 0 |
Accounts Receivable, Credit Loss Expense (Reversal) | 21,000 | 1,000 | 4,000 |
Accounts Receivable, Allowance for Credit Loss | 17,000 | $ 16,000 | $ 16,000 |
Asset Retirement Obligation | $ 4,000 |  |  |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Services Sector [Member] |  |  |  |
Concentration Risk, Percentage | 27.00% | 28.00% | 29.00% |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Automotive [Member] |  |  |  |
Concentration Risk, Percentage | 20.00% | 17.00% | 17.00% |
Assembly Atlanta Project [Member] |  |  |  |
Proceeds From Project | $ 64,000 |  |  |
Proceeds from Project Where Ownership Will Be Transferred | 46,000 |  |  |
Proceeds From Construction Costs Incurred | 18,000 |  |  |
Increase (Decrease) in Deferred Revenue | 8,000 |  |  |
Proceeds from Sale of Productive Assets | 38,000 |  |  |
Proceeds From Reimbursement of Development Costs | 18,000 |  |  |
Wells Fargo Bank, N.A. [Member] |  |  |  |
Accounts Receivable Securitization Program Maximum Capacity |  |  |  | $ 300,000
Proceeds from Accounts Receivable Securitization | 300,000 |  |  |
Accounts Receivable Securitization, Unsold Receivables | 296,000 |  |  |
Accounts Receivable Securitization, Total Receivables | 596,000 |  |  |
Accounts Receivable Securitization, Charge for Discount | $ 9,000 |  |  |
Wells Fargo Bank, N.A. [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.00% |  |  |
Diamond Sports Group, LLC [Member] |  |  |  |
Accounts Receivable, Allowance for Credit Loss | $ 17,000 |  |  |

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