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Note 7 - Capital Stock (Details Textual) - USD ($) | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 10, 2017 | Oct. 31, 2017 | Feb. 29, 2016 | May 31, 2015 | Apr. 05, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 30, 2017 | Mar. 31, 2016 | Jun. 30, 2015
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 |  |  |  |  |  | 11,529,124 | 11,510,863 |  |  |  |
Common Stock, Shares, Outstanding |  |  |  |  |  | 6,160,889 | 6,396,803 |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  |  | 0 | 0 |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  | $ 6,348,000 | $ 21,056,000 | $ 19,278,000 |  |  |
Treasury Stock, Shares |  |  |  |  |  | 5,368,235 | 5,114,060 |  |  |  |
Treasury Stock, Value |  |  |  |  |  | $ 129,183,000 | $ 122,835,000 |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  |  | 0 | 0 |  |  |  |
The 2017 Tender Offer [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  | 400,000 |  |  |  |  |  |  |  |  |
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 |  | 126,060 |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 143,859 |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 30 |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 4,400,000 |  |  |  |  |  |  |  |  |  |
The 2017 Tender Offer [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share | $ 27 |  |  |  |  |  |  |  |  |  |
The 2017 Tender Offer [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share | $ 30 |  |  |  |  |  |  |  |  |  |
The 2016 Tender Offer [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  | 325,000 |  |  |  |  |  |  | 425,000 |
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 |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  | 567,413 |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  | $ 31 |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  | $ 17,700,000 |  |  |  |  |  |
The 2016 Tender Offer [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share |  |  | $ 31 |  |  |  |  |  |  |  |
The 2016 Tender Offer [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share |  |  | $ 34 |  |  |  |  |  |  |  |
The 2015 Tender Offer [Member] |  |  |  |  |  |  |  |  |  |  |
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, Shares, Acquired |  |  |  | 298,566 |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  | $ 17,800,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
September 2011 Reauthorization [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  |  |  | 500,000 |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  | 110,316 |  |  |  |  |

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