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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) Rate | Dec. 31, 2021 USD ($) | Dec. 31, 2020 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 | 101 |  |
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount | $ 18,000 | $ 0 | $ 0
Accounts Receivable, Credit Loss Expense (Reversal) | 1,000 | 4,000 | $ 2,000
Asset Retirement Obligation, Ending Balance | $ 4,000 | $ 3,000 |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Services Sector [Member] |  |  |
Concentration Risk, Percentage | 28.00% | 29.00% | 28.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Automotive [Member] |  |  |
Concentration Risk, Percentage | 17.00% | 17.00% | 21.00%

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