Revenue (Details Textual) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2018	Jun. 30, 2018	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Revenue (Textual)
Received orders from backlogs			$ 13,000	$ 67,000	$ 393,000
Orders received from customers	$ 1,245,000
Orders cleared from customers		$ 901,000