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Senior Convertible Debentures (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 01, 2009
Debt Instrument [Line Items]      
Senior Convertible Debentures $ 0 $ 6,044,000  
Senior Convertible Debt [Member] | Senior Convertible Debentures issued December 1, 2009 [Member]      
Debt Instrument [Line Items]      
Senior Convertible Debentures     $ 6,100,000
Interest rate per year     8.00%