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7. Stockholders' Equity (Details) - shares | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Common Class A [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares, Issued |  | 24,454,000 | 24,230,000 | 23,972,000 | 23,681,000
Stock Issued During Period, Shares, Conversion of Convertible Securities |  | 13,000 | 18,000 | 5,000 |
Stock Issued During Period, Shares, New Issues |  | 211,000 | 240,000 | 286,000 |
Common Stock, Voting Rights |  | .10 |  |  |
Election Percentage for Board of Directors |  | 25.00% |  |  |
Common Class B [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares, Issued |  | 5,124,000 | 5,131,000 | 5,099,000 | 5,097,000
Stock Issued During Period, Shares, Conversion of Convertible Securities |  | (13,000) | (18,000) | (5,000) |
Stock Issued During Period, Shares, New Issues |  | 6,000 | 50,000 | 7,000 |
Common Stock, Voting Rights |  | 1 |  |  |
Election Percentage for Board of Directors |  | 75.00% |  |  |
Treasury Class-A [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury Stock, Shares, Acquired | 122 |  |  |  |
Treasury Class B [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury Stock, Shares, Acquired | 917 |  |  |  |

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- Definition Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 + Details
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