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Note 9 - Capital Stock (Details Textual) |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 26, 2021 USD ($) $ / shares shares | Aug. 16, 2021 | Jul. 27, 2021 $ / shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) | Nov. 30, 2021 shares | Jul. 31, 2021 shares
Common Stock, Shares Authorized (in shares) |  |  |  | 50,000,000 | 50,000,000 |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  | $ 0.01 | $ 0.01 |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  | 10,000,000 | 10,000,000 |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  | $ 0.01 | $ 0.01 |  |  |
Common Stock, Shares, Issued (in shares) |  |  |  | 22,293,687 | 34,574,807 |  |  |
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  |  |  | 22,166,450 | 22,348,022 |  |  |
Preferred Stock, Shares Issued, Total (in shares) |  |  |  | 0 | 0 |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  |  |  | 200,000
Treasury Stock, Value, Acquired, Cost Method | $ |  |  |  | $ 7,000,000 | $ 10,828,000 | $ 2,281,000 |  |
Treasury Stock, Shares, Total (in shares) |  |  |  | 127,237 | 12,226,785 |  |  |
Treasury Stock, Value, Total | $ |  |  |  | $ 4,000,000 | $ 169,946,000 |  |  |
The 2019 Tender Offer [Member] |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) | 272,405 |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares | $ 37.00 |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ | $ 10,100,000 |  |  |  |  |  |  |
The 2019 Tender Offer [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program Additional Shares Authroized To Be Repurchased Percent Of Outstanding Shares Percent |  |  | 2.00% |  |  |  |  |
Treasury Stock Acquired Cost Per Share (in dollars per share) | $ / shares |  |  | $ 32.00 |  |  |  |  |
The 2019 Tender Offer [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share (in dollars per share) | $ / shares |  |  | $ 37.00 |  |  |  |  |
September 2011 Reauthorization [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  |  | 500,000 |
Treasury Stock, Shares, Acquired (in shares) |  |  |  | 168,847 | 18,732 |  |  |
Stock Split To [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 2 |  | 2 |  |  |  |

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