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7. Stockholders' Equity (Details) - shares
 3 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Common Class A [Member]          
Class of Stock [Line Items]          
Shares, Issued   24,230,000 23,972,000 23,681,000 23,333,000
Stock Issued During Period, Shares, Conversion of Convertible Securities   18,000 5,000 80,000  
Stock Issued During Period, Shares, New Issues   240,000 286,000 268,000  
Common Stock, Voting Rights   .10      
Election Percentage for Board of Directors   25.00%      
Common Class B [Member]          
Class of Stock [Line Items]          
Shares, Issued   5,131,000 5,099,000 5,097,000 5,150,000
Stock Issued During Period, Shares, Conversion of Convertible Securities   (18,000) (5,000) (80,000)  
Stock Issued During Period, Shares, New Issues   50,000 7,000 27,000  
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