Note 10 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | 12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2021 |
Sep. 30, 2021 |
Jun. 30, 2021 |
Mar. 31, 2021 |
Dec. 31, 2020 |
Sep. 30, 2020 |
Jun. 30, 2020 |
Mar. 31, 2020 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Jan. 12, 2016 |
Jul. 28, 2015 |
|
| Preferred Stock, Shares Authorized (in shares) | 5,000,000 | 5,000,000 | 5,000,000 | 5,000,000 | ||||||||
| Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | ||||||||
| Common Stock, Shares Authorized (in shares) | 50,000,000 | 50,000,000 | 50,000,000 | 50,000,000 | ||||||||
| Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | ||||||||
| Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | ||||
| Dividends, Common Stock, Total | $ 9.1 | $ 9.1 | ||||||||||
| Stock Repurchase Program, Authorized Amount | $ 70.0 | $ 15.0 | ||||||||||
| Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 21.9 | $ 21.9 | ||||||||||
| X | ||||||||||
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Face amount or stated value per share of common stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of stock repurchase plan authorized. No definition available.
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| X | ||||||||||
- Definition Amount remaining of a stock repurchase plan authorized. No definition available.
|