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Note 7 - Capital Stock (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 29, 2016 | May. 31, 2015 | Nov. 30, 2014 | Nov. 30, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2015 | May. 31, 2014
September 2011 Authorization [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  | 37,850 | 50,325 | 0 | 224,000 |  |
The 2016 Tender Offer [Member] | Subsequent Event [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share | $ 27 |  |  |  |  |  |  |  |  |  |
The 2016 Tender Offer [Member] | Subsequent Event [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share | $ 30 |  |  |  |  |  |  |  |  |  |
The 2016 Tender Offer [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 325,000 |  |  |  |  |  |  |  |  |  |
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 | 142,413 |  |  |  |  |  |  |  |  |  |
The 2015 Tender Offer [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share |  | $ 59 |  |  |  |  |  |  |  |  |
The 2015 Tender Offer [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share |  | $ 63 |  |  |  |  |  |  |  |  |
The 2015 Tender Offer [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  | 298,566 |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  | 80,000 |  |  |  |  |  |  |  | 150,000 |
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 |  | 148,566 |  |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share |  | $ 59 |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  | $ 17,800,000 |  |  |  |  |  |  |  |  |
The 2014 Tender Offer [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share |  |  | $ 46 |  |  |  |  |  |  |  |
The 2014 Tender Offer [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share |  |  | $ 50 |  |  |  |  |  |  |  |
The 2014 Tender Offer [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 571,865 |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  | 640,000 |  |  |  |  |  |  |  |
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 |  |  | 160,000 |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share |  |  | $ 50 |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  | $ 28,700,000 |  |  |  |  |  |  |  |
The 2013 Tender Offer [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share |  |  |  | $ 19 |  |  |  |  |  |  |
The 2013 Tender Offer [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share |  |  |  | $ 21 |  |  |  |  |  |  |
The 2013 Tender Offer [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  | 675,000 |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  | 600,000 |  |  |  |  |  |  |
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 |  |  |  | 173,000 |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share |  |  |  | $ 20.50 |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  | $ 13,900,000 |  |  |  |  |  |  |
September 2011 Reauthorization [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  | 31,263 | 33,341 |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  |  |  |  |  | 500,000
Preferred Stock, Shares Issued |  |  |  |  | 0 | 0 |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  | 40,000,000 | 40,000,000 |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  | 10,000,000 | 10,000,000 |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |
Common Stock, Shares, Issued |  |  |  |  | 11,497,471 | 11,474,096 |  |  |  |  |
Common Stock, Shares, Outstanding |  |  |  |  | 7,116,661 | 7,423,115 |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  | $ 19,278,000 | $ 30,810,000 | $ 14,452,000 |  |  |  |
Treasury Stock, Shares |  |  |  |  | 4,380,810 | 4,050,981 |  |  |  |  |
Treasury Stock, Value |  |  |  |  | $ 101,779,000 | $ 82,501,000 |  |  |  |  |

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