GOODWILL AND INTANGIBLE ASSETS: (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill Sold [Line Items]
Goodwill Sold	$ 5,100,000
Amortization of intangible assets	479,000	$ 627,000	$ 830,000
Customer list intangible
Goodwill Sold [Line Items]
Customer List Sold	$ 0.4