SIGNIFICANT ACCOUNTING POLICIES (Details Textual)	12 Months Ended
	Dec. 31, 2018
Disclosure Of Significant Accounting Policies [Line Items]
Percentage Of Plant Capacity	70.00%
Percentage Of Bid Amount to be included in inventory	51.00%
De Beers [Member]
Disclosure Of Significant Accounting Policies [Line Items]
Percentage Of Bid price As Revenue	49.00%