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Note 6 - Stockholders' Equity (Details Textual)		3 Months Ended	6 Months Ended
	Jan. 02, 2019 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) shares	Jun. 30, 2019 USD ($) shares	Jun. 30, 2018 USD ($)	Dec. 31, 2018 shares	Nov. 06, 2016 USD ($)	Mar. 31, 2006 shares	Mar. 31, 2004 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
Stock Issued During Period, Value, Employee Benefit Plan | $		$ 4,000,000
Common Stock, Capital Shares Reserved for Future Issuance			6,163,624
Common Stock [Member]
Stock Issued During Period, Shares, Employee Benefit Plan		196,509	196,509
Stock Issued During Period, Value, Employee Benefit Plan | $		$ 4,000,000	$ 4,000,000
March 2004 Authorization [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased								2,000,000.0
The 2004-2006 Repurchase Authorization [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased							5,000,000.0
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased			279,200
The 2016 Repurchase Authorization [Member]
Stock Repurchase Program, Authorized Amount | $						$ 75,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $			$ 50,000,000
Raycom [Member]
Payments of Stock Issuance Costs | $	$ 100,000
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
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
Common Class A [Member] | Common Stock [Member]
Stock Issued During Period, Shares, Employee Benefit Plan		0
Stock Issued During Period, Value, Employee Benefit Plan | $		$ 0

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- Definition

With regard to the voting rights of a particular class of common stock, represents the number of votes per share to which shareholders are entitled.

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Number of shares of equity interests issued or issuable to acquire entity.

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-SubTopic 30
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Number of authorized capital units or capital shares. This element is relevant to issuers of face-amount certificates and registered investment companies.

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Aggregate number of common shares reserved for future issuance.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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The cash outflow for cost incurred directly with the issuance of an equity security.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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