RELATED PARTY TRANSACTIONS (Details)			12 Months Ended
	Feb. 01, 2017 USD ($)	Mar. 01, 2016 USD ($) item	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
BKF Capital
RELATED PARTY TRANSACTIONS
Number of offices leased out | item		1
Revenue from related parties per month	$ 250	$ 1,000
Revenue from related parties			$ 4,000	$ 12,000
Receivable from related party			0	1,000
Qualstar
Due from Qualstar
Due from Qualstar, beginning balance			2,000
Billed to Qualstar by Interlink			28,000	13,000
Paid by Qualstar to Interlink			(13,000)	(11,000)
Due from Qualstar, end balance			17,000	2,000
Due to Qualstar
Due to Qualstar, beginning balance			1,000	6,000
Billed to Interlink by Qualstar			13,000	34,000
Paid by Interlink to Qualstar			$ (14,000)	(39,000)
Due to Qualstar, end balance				$ 1,000