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Note 6 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 02, 2019 $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Nov. 04, 2020 USD ($) | Nov. 05, 2019 USD ($)
Capital Units, Authorized (in shares) | shares |  | 245,000,000 |  |  |  |
Common Stock, Shares Authorized (in shares) | shares |  | 200,000,000 | 200,000,000 |  |  |
Preferred Stock, Shares Authorized (in shares) | shares |  | 20,000,000 |  |  |  |
Common Stock, Voting Rights, Votes Per Share |  | 1 |  |  |  |
Dividends, Common Stock, Total | $ |  | $ 0 | $ 0 | $ 0 |  |
Treasury Stock, Value, Acquired, Cost Method | $ |  | 75,000 | $ 32,000 | $ 19,000 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ |  | $ 204,000 |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares |  | 4,006,948 | 6,130,944 |  |  |
Repurchase Authorization 2019 [Member] |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ |  |  |  |  |  | $ 150,000
Treasury Stock, Shares, Acquired (in shares) | shares |  | 3,688,022 |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares |  | $ 13.81 |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ |  | $ 51,000 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ |  | $ 68,000 |  |  |  |
Issuers Repurchase Program 2019 [Member] |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) | 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 |  |  |  |
Repurchase Authorization 2020 [Member] |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) | shares |  | 864,026 |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares |  | $ 16.47 |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ |  | $ 14,000 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ |  | $ 136,000 |  |  |  |
Stock Repurchase Program, Additional Authorized Amount | $ |  |  |  |  | $ 150,000 |
Raycom [Member] | Common Stock [Member] |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | 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) | shares |  | 25,000,000 | 25,000,000 |  |  |
Common Stock, Voting Rights, Votes Per Share |  | 10 |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares |  | 1,336,440 | 1,503,254 |  |  |

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