Quarterly report pursuant to Section 13 or 15(d)

Description of business and summary of significant accounting policies - Additional Information (Details)

v3.7.0.1
Description of business and summary of significant accounting policies - Additional Information (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
segment
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]          
Number of Operating Segments | segment 1        
Revenues, Bill And Hold $ 1,140,699 $ 140,600      
Loss on Contracts 35,285.10 $ 155,200      
Allowance for Doubtful Accounts Receivable, Current $ 30,000   $ 30,000    
Inventory Valuation Reserves       $ 230,000 $ 266,000