Quarterly report pursuant to Section 13 or 15(d)

Liquidity (Details Textual)

v3.19.1
Liquidity (Details Textual) - USD ($)
1 Months Ended
Apr. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Liquidity [Line Items]            
Cash and cash equivalents   $ 250,464 $ 1,368,395 $ 4,512,894 $ 1,368,395 $ 4,870,824
Cash backlog   $ 95,800,000        
Subsequent Event [Member]            
Liquidity [Line Items]            
Net proceeds $ 692,248