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Note 6 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 24, 2021 $ / shares | Sep. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) $ / shares | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) $ / shares | Dec. 31, 2020 shares
Capital Units, Authorized (in shares) |  | 245,000,000 |  |  |  |  |  | 245,000,000 |  |
Common Stock, Shares Authorized (in shares) |  | 200,000,000 |  |  |  |  |  | 200,000,000 |  | 200,000,000
Preferred Stock, Shares Authorized (in shares) |  | 20,000,000 |  |  |  |  |  | 20,000,000 |  |
Common Stock, Voting Rights, Votes Per Share |  | 1 |  |  |  |  |  | 1 |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares |  | $ 0.08 |  |  | $ 0 |  |  | $ 0.24 | $ 0 |
Dividends, Common Stock, Total | $ |  | $ 8,000 | $ 7,000 | $ 8,000 |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  | 3,209,452 |  |  |  |  |  | 3,209,452 |  | 4,006,948
Treasury Stock, Value, Acquired, Cost Method | $ |  |  |  |  | $ 10,000 | $ 43,000 | $ 6,000 |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) |  | 25,000,000 |  |  |  |  |  | 25,000,000 |  | 25,000,000
Common Stock, Voting Rights, Votes Per Share |  | 10 |  |  |  |  |  | 10 |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  | 1,103,015 |  |  |  |  |  | 1,103,015 |  | 1,336,440
Common Stock and Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares | $ 0.08 |  |  |  |  |  |  |  |  |
Dividends, Common Stock, Total | $ |  |  |  |  |  |  |  | $ 23,000 | $ 0 |
Treasury Stock, Value, Acquired, Cost Method | $ |  |  |  |  |  |  |  | 0 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ |  | $ 204,000 |  |  |  |  |  | $ 204,000 |  |

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