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Selling Arrangement (Details) (USD $)
1 Months Ended 3 Months Ended
Feb. 28, 2011
Mar. 31, 2014
Mar. 31, 2013
Selling Arrangement      
Payment for arrangement to sell signs   $ 188,000  
Selling Agreement
     
Selling Arrangement      
Payment for arrangement to sell signs 4,000,000    
Term of arrangement 10 years    
Amortization expense   100,000 100,000
2014   400,000  
2015   400,000  
2016   400,000  
2017   400,000  
2018   $ 400,000