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RELATED PARTY TRANSACTIONS (Details)				1 Months Ended			3 Months Ended		9 Months Ended
	Mar. 01, 2018 USD ($)	Mar. 01, 2017 USD ($) Office	Feb. 01, 2017 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Feb. 28, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Cost sharing arrangement
RELATED PARTY TRANSACTIONS
Percentage share of rent and lease-related costs				47.50%
BKF Capital
RELATED PARTY TRANSACTIONS
Sharing costs from related party							$ 3,805	$ 0	$ 3,805	$ 1,500
Receivable from related party							0		0		$ 0
BKF Capital | Westlake Village, CA office
RELATED PARTY TRANSACTIONS
Number of offices leased out | Office		1
Fee per month	$ 250	$ 1,000	$ 250			$ 250
BKF Capital | Cost sharing arrangement
RELATED PARTY TRANSACTIONS
Sharing costs from related party							612		612
Percentage share of rent and lease-related costs				5.00%
Qualstar
Due from Qualstar
Due from Qualstar, beginning balance							48,000	1,000	24,000	3,000
Billed to Qualstar by Interlink							127,000	43,000	381,000	157,000
Paid by Qualstar to Interlink							(162,000)	(31,000)	(392,000)	(147,000)
Due from Qualstar, end balance				$ 48,000	$ 1,000		13,000	13,000	13,000	13,000
Due to Qualstar
Due to Qualstar, beginning balance							7,000	1,000	12,000	2,000
Billed to Interlink by Qualstar							18,000	15,000	71,000	25,000
Paid by Interlink to Qualstar							(20,000)	(9,000)	(78,000)	(20,000)
Due to Qualstar, end balance				$ 7,000	1,000		$ 5,000	$ 7,000	$ 5,000	$ 7,000
Qualstar | Cost sharing arrangement
RELATED PARTY TRANSACTIONS
Percentage share of rent and lease-related costs				47.50%
BKF Capital | Qualstar
RELATED PARTY TRANSACTIONS
Fee per month					$ 250

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