Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Principles (Details Textual 2)

v3.8.0.1
Summary of Significant Accounting Principles (Details Textual 2)
12 Months Ended
Dec. 31, 2017
Customer
Dec. 31, 2016
Customer
Mar. 13, 2013
ft²
a
Dealer
Summary of Significant Accounting Principles (Textual)      
Number of dealers | Dealer     440
Area of facilities covered (in sq ft) | ft²     250,000
Area of land (in acres) | a     47
Leases receivable, term 8 years    
Net sales [Member]      
Summary of Significant Accounting Principles (Textual)      
Concentration risk, percentage 98.00% 91.00%  
Number of customers | Customer 1 1