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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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