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Note 8 - Stockholders' Equity (Details Textual) | 12 Months Ended | 53 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 shares | Dec. 31, 2014 shares | Dec. 31, 2013 shares | Dec. 31, 2015 $ / shares shares | Jul. 20, 2012 shares | Aug. 31, 2011 shares
Common Class A [Member] | Additional Shares Authorized [Member] |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  | 1,000,000 |
Common Class A [Member] |  |  |  |  |  |
Conversion of Common Stock Shares | 1 |  |  |  |  |
Common Stock Number of Votes | 1 |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  | 2,000,000
Stock Repurchased During Period, Shares | 228,737 | 226,729 | 127,900 | 1,700,000 |  |
Treasury Stock Acquired, Average Cost Per Share | $ / shares |  |  |  | $ 41.34 |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 1,300,000 |  |  | 1,300,000 |  |
Common Class B [Member] |  |  |  |  |  |
Percentage of Class B Common to Total Common Stock Subject to Automatic Conversion | 1.00% |  |  |  |  |
Common Stock Number of Votes | 10 |  |  |  |  |

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- Definition Represents the percentage number of shares of Class B common stock outstanding representing less than 1% of the total number of shares of common stock outstanding that would be subject to automatic conversion. + References No definition available. + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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