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Note 6 - Common Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 19, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 04, 2020
Common Stock, No Par Value (in dollars per share) |  | $ 0 | $ 0 |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 420,000
Stock Repurchased During Period, Shares (in shares) | 14,000,000 |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.01 |  |  |
Stock Repurchased During Period, Price Per Share (in dollars per share) | $ 30 |  |  |
Stock Repurchased During Period, Value | $ 420,000 |  |  |
Percentage of Outstanding Shares Repurchased | 32.67% |  |  |
Shares Buyback Equity Impact, Amount |  |  | $ (420,000) |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  | 1,100,000 | 1,800,000 |
Proceeds from Issuance of Common Stock |  | $ 8,000 | $ 10,300 |
Common Stock [Member] |  |  |  |
Stock Repurchased During Period, Price Per Share (in dollars per share) | $ 6.99 |  |  |
Shares Buyback Equity Impact, Amount | $ 97,900 |  |  |
Retained Earnings [Member] |  |  |  |
Stock Repurchased During Period, Price Per Share (in dollars per share) | $ 23.34 |  |  |
Shares Buyback Equity Impact, Amount | $ (322,100) |  | $ (322,140) |
Minimum [Member] |  |  |  |
Stock Repurchase Program, Purchase Price Per Share (in dollars per share) |  |  |  | $ 30.00
Shares Issued, Price Per Share (in dollars per share) |  | $ 3.27 | $ 2.71 |
Maximum [Member] |  |  |  |
Stock Repurchase Program, Purchase Price Per Share (in dollars per share) |  |  |  | $ 33.00
Shares Issued, Price Per Share (in dollars per share) |  | $ 15.00 | $ 19.09 |

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