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Note 9 - Capital Stock (Details Textual) - USD ($) |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 13, 2019 | May 13, 2019 | Jun. 08, 2018 | May 08, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 30, 2017
Common Stock, Shares Authorized (in shares) |  |  |  |  | 40,000,000 | 40,000,000 |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  | $ 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) |  |  |  |  | $ 0.01 | $ 0.01 |  |
Common Stock, Shares, Issued, Total (in shares) |  |  |  |  | 11,695,719 | 11,656,160 |  |
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  |  |  |  | 5,727,895 | 5,748,897 |  |
Preferred Stock, Shares Issued, Total (in shares) |  |  |  |  | 0 | 0 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  | $ 2,281,000 | $ 14,285,000 | $ 13,369,000 |
Treasury Stock, Shares, Ending Balance (in shares) |  |  |  |  | 5,967,824 | 5,907,263 |  |
Treasury Stock, Value, Ending Balance |  |  |  |  | $ 159,118,275 | $ 156,837,000 |  |
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% |  |  |  |  |  |
Stock Repurchase Program Additional Shares Authorized To Be Repurchased Percent Of Outstanding Shares, Shares (in shares) |  | 118,996 |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) | 192,743 |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ 60.00 |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 11,600,000 |  |  |  |  |  |  |
The 2019 Tender Offer [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share (in dollars per share) |  | $ 55.00 |  |  |  |  |  |
The 2019 Tender Offer [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share (in dollars per share) |  | $ 60.00 |  |  |  |  |  |
The 2018 Tender Offer [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  | 100,000 |  |  |  |
Stock Repurchase Program Additional Shares Authroized To Be Repurchased Percent Of Outstanding Shares Percent |  |  |  | 2.00% |  |  |  |
Stock Repurchase Program Additional Shares Authorized To Be Repurchased Percent Of Outstanding Shares, Shares (in shares) |  |  |  | 124,248 |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  |  | 185,597 |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  | $ 40.00 |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  | $ 7,500,000 |  |  |  |  |
The 2018 Tender Offer [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share (in dollars per share) |  |  |  | $ 39.00 |  |  |  |
The 2018 Tender Offer [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share (in dollars per share) |  |  |  | $ 43.00 |  |  |  |
September 2011 Reauthorization [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  |  |  | 500,000
Treasury Stock, Shares, Acquired (in shares) |  |  |  |  | 60,561 | 58,934 |  |

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