Note 6 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Jan. 02, 2019 $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) $ / shares
Capital Units, Authorized			245,000,000
Common Stock, Shares Authorized			200,000,000	200,000,000
Preferred Stock, Shares Authorized			20,000,000
Common Stock, Voting Rights, Votes Per Share			1
Dividends, Common Stock, Total | $			$ 0	$ 0	$ 0
Proceeds from Issuance of Common Stock | $			0	0	239,000
Treasury Stock, Value, Acquired, Cost Method | $			$ 32,000	$ 19,000	$ 4,000
Common Stock, Capital Shares Reserved for Future Issuance			6,130,944	7,078,916
Repurchase Authorization 2019 [Member]
Treasury Stock, Shares, Acquired			1,659,684
Treasury Stock Acquired, Average Cost Per Share | $ / shares			$ 19.10
Treasury Stock, Value, Acquired, Cost Method | $			$ 32,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $			$ 129,000
Raycom [Member] | Common Stock [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	11,500,000
Shares Issued, Price Per Share | $ / shares	$ 14.74
Underwritten Offering [Member]
Stock Issued During Period, Shares, New Issues		17,250,000
Share Price | $ / shares		$ 14.50			$ 14.50
Proceeds from Issuance of Common Stock | $		$ 239,000
Issuance of Stock, Underwriting Discount | $		11,000
Issuance of Stock, Underwriting Expenses | $		$ 1,000
Common Class A [Member]
Common Stock, Shares Authorized			25,000,000	25,000,000
Common Stock, Voting Rights, Votes Per Share			10
Common Stock, Capital Shares Reserved for Future Issuance			1,503,254	1,703,064