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Selling Arrangement (Details Narrative) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Selling Arrangement    
Payments for arrangements to sell signs $ 4,000,000  
Term of arrangement 10 years  
Amortization expense $ 61,000 $ 15,000
Amortization expense for the remainder of 2020 $ 97,000