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Restatement (Details 2) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Change in Accounting Estimate [Line Items]        
Income (loss) including noncontrolling interest $ (1,528,606) $ 234,102 $ (1,734,101) $ 847,043
Changes in deferred tax $ (534,673) $ 31,678 (653,123) (53,656)
Interest receivable on sales type leases     (358,904) (2,730,500)
Collection of principal on sales type leases     1,716,968 370,139
Accounts receivable     (1,386,881) (1,469,996)
Other receivables     (190,118) (320,537)
Net cash provided by operating activities     1,752,281 (1,182,172)
As Previously Reported [Member]        
Change in Accounting Estimate [Line Items]        
Income (loss) including noncontrolling interest     (1,920,800) 565,677
Changes in deferred tax     (427,551) 117,315
Interest receivable on sales type leases     (569,647) (2,922,393)
Collection of principal on sales type leases     2,084,149 574,006
Accounts receivable    
Other receivables     (1,772,310) (1,692,112)
Net cash provided by operating activities     1,752,281 (1,182,172)
Net Adjustment [Member]        
Change in Accounting Estimate [Line Items]        
Income (loss) including noncontrolling interest     186,699 281,366
Changes in deferred tax     (225,572) (170,971)
Interest receivable on sales type leases     210,743 191,893
Collection of principal on sales type leases     (367,181) (203,867)
Accounts receivable     (1,386,881) (1,469,996)
Other receivables     1,582,192 1,371,575
Net cash provided by operating activities