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Selling Arrangement (Details Narrative) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Selling Arrangement    
Payments for arrangements to sell signs $ 4,000,000  
Term of arrangement 10 years  
Amortization expense $ 150,000 $ 100,000
2019 600,000  
2020 262,000  
2021 $ 55,000