Major Customers (Details) - Customers	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Major Customers (Textual)
Description of changed payment terms	30 days to 90 days.
Net sales [Member]
Major Customers (Textual)
Concentration risk, percentage	10.00%	10.00%
Number of customers	2	2
Net sales [Member] | Customer One [Member]
Major Customers (Textual)
Concentration risk, percentage	21.70%	22.50%
Net sales [Member] | Customer Two [Member]
Major Customers (Textual)
Concentration risk, percentage	11.40%	11.90%
Trade accounts receivable [Member]
Major Customers (Textual)
Concentration risk, percentage	41.00%	25.50%
Number of customers	2	2
Trade accounts receivable [Member] | Customer One [Member]
Major Customers (Textual)
Concentration risk, percentage	25.20%	14.00%
Trade accounts receivable [Member] | Customer Two [Member]
Major Customers (Textual)
Concentration risk, percentage	15.80%	11.50%