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Note 5 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Thousands | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) $ / shares shares | Dec. 31, 2017 shares | Nov. 06, 2016 USD ($) | Mar. 31, 2006 shares | Nov. 30, 2004 shares | Mar. 31, 2004 shares
Capital Units, Authorized | 245,000,000 |  |  |  |  |
Common Stock, Shares Authorized | 200,000,000 | 100,000,000 |  |  |  |
Preferred Stock, Shares Authorized | 20,000,000 |  |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance | 82,022,500 | 83,253,588 |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance | 0 |  |  |  |  |
Common Stock, Voting Rights, Votes Per Share | 1 |  |  |  |  |
Dividends, Common Stock, Total | $ | $ 0 |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ | $ 19,607 |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 7,078,916 |  |  |  |  |
March 2004 Authorization [Member] |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  | 2,000,000
The 2004-2006 Repurchase Authorization [Member] |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  | 5,000,000 |  |
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 |  |  |
Treasury Stock, Shares, Acquired | 1,551,710 |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ / shares | $ 12.64 |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ | $ 19,600 |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ | $ 49,500 |  |  |  |  |
November 2004 Authorization [Member] |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  | 2,000,000 |
Common Class A [Member] |  |  |  |  |  |
Common Stock, Shares Authorized | 25,000,000 | 25,000,000 |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance | 6,729,035 | 6,598,377 |  |  |  |
Common Stock, Voting Rights, Votes Per Share | 10 |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 1,703,064 |  |  |  |  |

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