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Note 6 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) | Nov. 06, 2016 USD ($) | Mar. 31, 2006 shares | Nov. 30, 2004 shares | Mar. 31, 2004 shares
Capital Units, Authorized |  | 245,000,000 |  |  |  |  |  |
Common Stock, Shares Authorized | 100,000,000 | 200,000,000 | 100,000,000 |  |  |  |  |
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 | $ |  |  | 238,945 |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ |  | $ 19,607 | $ 4,000 | $ 2,000 |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 7,422,965 | 7,078,916 | 7,422,965 |  |  |  |  |
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 |
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 | $ | $ 238,900 |  |  |  |  |  |  |
Issuance of Stock, Underwriting Discount | $ | 10,600 |  |  |  |  |  |  |
Issuance of Stock, Underwriting Expenses | $ | $ 600 |  |  |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |
Common Stock, Shares Authorized | 15,000,000 | 25,000,000 | 15,000,000 |  |  |  |  |
Common Stock, Voting Rights, Votes Per Share |  | 10 |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 1,923,144 | 1,703,064 | 1,923,144 |  |  |  |  |

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