Note 6 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Thousands		3 Months Ended				9 Months Ended
	Jan. 02, 2019 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) shares	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($)	Dec. 31, 2019 shares	Nov. 05, 2019 USD ($)
Capital Units, Authorized (in shares)		245,000,000				245,000,000
Common Stock, Shares Authorized (in shares)		200,000,000				200,000,000		200,000,000
Preferred Stock, Shares Authorized (in shares)		20,000,000				20,000,000
Common Stock, Voting Rights, Votes Per Share		1				1
Dividends, Common Stock, Total | $						$ 0	$ 0
Treasury Stock, Value, Acquired, Cost Method | $		$ 10,000	$ 43,000	$ 6,000	$ 11,000
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		4,776,948				4,776,948
Repurchase Authorization 2019 [Member]
Stock Repurchase Program, Authorized Amount | $									$ 150,000
Treasury Stock, Shares, Acquired (in shares)						3,579,342
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares						$ 13.75
Treasury Stock, Value, Acquired, Cost Method | $						$ 49,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $		$ 70,000				$ 70,000
Issuers Repurchase Program 2019 [Member]
Treasury Stock, Shares, Acquired (in shares)						905,836
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares						$ 11.02
Treasury Stock, Value, Acquired, Cost Method | $						$ 10,000
Raycom [Member]
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | $	$ 100
Raycom [Member] | Common Stock [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)	11,500,000
Shares Issued, Price Per Share (in dollars per share) | $ / shares	$ 14.74
Common Class A [Member]
Common Stock, Shares Authorized (in shares)		25,000,000				25,000,000		25,000,000
Common Stock, Voting Rights, Votes Per Share		10				10
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		1,336,440				1,336,440