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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:        
Net income (loss) $ 1,943,347 $ 395,389 $ 4,050,824 $ (8,772,757)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:        
Amortization of OID and debt issuing costs of notes 68,750 39,583 61,895 97,161
Stock compensation expense 10,999 10,999 148,625
Operating lease expenses 33,873 32,502 55,519 66,262
Asset impairment loss     876,660
Bad debt allowance (reversal)     (6,031,058) 5,386,003
Loss on disposal of 40% ownership of Fund Management Co     46,461
Loss on transfer of Chengli Boxing system     624,133
Loss on transfer of Xuzhou Huayu system     397,033
Loss on transfer of Shenqiu Phase I & II systems     208,359
Loss on disposal of fixed assets     289
Bad debts expense (reversal) (34,579) (1,649,622)    
Loss on note conversion 821,633 198,330 502,393 173,886
Interest expense-inducement on note conversion     893,958
Changes in deferred tax     (3,024,807)
Interest expense 818,914    
Gain on termination of buy-back agreement of Chengli project (3,155,959)    
Changes in assets and liabilities:        
Interest receivable on sales type leases     (170,403)
Collection of principal and interest on sales type leases for Pucheng systems 13,879,575 14,149,790
Accounts receivable 345,788 35,552,191 72,933,179 2,383,251
Prepaid expenses 23,571 919 (3,596) (21,126)
Other receivables 2,380 (3,589) (3,549) (135,938)
Accounts payable     (2,153,320) (2,837,609)
Taxes payable (894,430) (2,121,622) (2,164,906) (1,317,882)
Payment of lease liability (33,873) (31,174) (58,226) (63,555)
Interest payable on entrusted loan 635,375 1,302,610 (9,091,732)
Accrued liabilities and other payables 198,034 57,740 (404,087) (36,932)
Refundable deposit for systems leasing     (478,368)
Net cash provided by (used in) operating activities (681,465) 46,996,596 82,248,467 (14,649,028)
CASH FLOWS FROM INVESTING ACTIVITIES:        
Purchase of property & equipment     (1,885)
Proceeds from disposal of property & equipment     5,074
Net cash provided by (used in) investing activities     (1,885) 5,074
CASH FLOWS FROM FINANCING ACTIVITIES:        
Repayment of entrusted loan     (27,125,768)
Issuance of notes payable 5,000,000 3,000,000 2,000,000
Issuance of common stock 37,561,721 497,187 3,309,475
Net cash provided by financing activities 42,561,721 3,497,187 (21,816,293)
EFFECT OF EXCHANGE RATE CHANGE ON CASH 1,309,890 (551,508) 5,838,947 (541,598)
NET INCREASE (DECREASE) IN CASH 43,190,146 46,445,088 91,582,716 (37,001,845)
CASH, BEGINNING OF PERIOD 107,804,013 16,221,297 16,221,297 53,223,142
CASH, END OF PERIOD 150,994,159 62,666,385 107,804,013 16,221,297
Supplemental cash flow data:        
Income tax paid 221,934
Interest paid 186,129
Supplemental disclosure of non-cash operating activities        
Settlement of entrusted loan resulting from termination of buy-back option for Chengli project 29,147,903    
Transfer of Tian’an project from construction in progress to accounts receivable 23,635,489 24,095,685
Transfer of Xuzhou Huayu Project and Shenqiu Phase I & II projects to Mr. Bai     35,415,556
Adoption of ASC 842-right-of-use asset 191,189 (118,234)
Adoption of ASC 842-operating lease liability 191,189 118,234
Supplemental disclosure of non-cash financing activities        
Conversion of notes into common shares $ 1,104,586 $ 2,057,191 $ 1,612,392