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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 | Jun. 13, 2019 USD ($) $ / shares shares | May 13, 2019 $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) | Nov. 30, 2021 shares | Jul. 31, 2021 shares
Common Stock, Shares Authorized (in shares) |  |  |  |  |  | 40,000,000 | 40,000,000 |  |  |
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, Total (in shares) |  |  |  |  |  | 23,400,796 | 23,391,438 |  |  |
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  |  |  |  |  | 11,174,011 | 11,455,790 |  |  |
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 | $ |  |  |  |  |  | $ 10,828,000 | $ 2,281,000 | $ 14,285,000 |  |
Treasury Stock, Shares, Ending Balance (in shares) |  |  |  |  |  | 12,226,785 | 11,935,648 |  |  |
Treasury Stock, Value, Ending Balance | $ |  |  |  |  |  | $ 169,946,199 | $ 159,118,000 |  |  |
The 2019 Tender Offer [Member] |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  | 200,000 |  |  |  |  |
Stock Repurchase Program Additional Shares Authroized To Be Repurchased Percent Of Outstanding Shares Percent |  |  |  |  | 2.00% |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) | 272,405 |  |  | 192,743 |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares | $ 37.00 |  |  | $ 60.00 |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ | $ 10,100,000 |  |  | $ 11,600,000 |  |  |  |  |  |
Stock Repurchase Program Additional Shares Authorized To Be Repurchased Percent Of Outstanding Shares, Shares (in shares) |  |  |  |  | 118,996 |  |  |  |  |
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 |  | $ 55.00 |  |  |  |  |
The 2019 Tender Offer [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share (in dollars per share) | $ / shares |  |  | $ 37.00 |  | $ 60.00 |  |  |  |  |
September 2011 Reauthorization [Member] |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  |  |  |  | 500,000 |
Treasury Stock, Shares, Acquired (in shares) |  |  |  |  |  | 18,732 | 60,561 |  |  |
Stock Split To [Member] |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 2 |  |  |  |  |  |  |  |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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