Annual report pursuant to Section 13 and 15(d)

Sale of Power Conversion Systems Division - Disposal Groups, Including Discontinued Operations (Details)

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Sale of Power Conversion Systems Division - Disposal Groups, Including Discontinued Operations (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Sale of Power Conversion Systems Division    
Accounts receivable, net   $ 270,768
Inventories, net   131,342
Prepayments and other current assets   22,322
Property and equipment, net   329,738
Intangible assets, net   342,153
Current assets held for sale (1) $ 0 1,096,323
Accounts payable   356,113
Accrued expenses   521,642
Current liabilities held for sale $ 0 $ 877,755