Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
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%

Number of television markets.

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Number of television markets with first and/or second-rated stations.

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Number of television markets with top-rated television stations.

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The percent of US television households reached through television markets.

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of impairment loss on investment in equity security without readily determinable fair value.

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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