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At June 30, 2021 and December 31, 2020, property and equipment consisted of: (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 11,147,000 $ 5,466,000
Accumulated depreciation and amortization (3,885,000) (3,343,000)
Property and equipment, net 7,262,000 2,123,000
Cryptocurrency Machines and Related Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 593,000 567,000
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 3,896,000 3,057,000
Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 672,000 490,000
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,567,000 0
Building [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,283,000 0
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 2,136,000 $ 1,352,000