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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Qualstar
Due from Qualstar
Due from Qualstar, beginning balance	$ 52	$ 24
Billed (or accrued) to Qualstar by Interlink	208	128
Paid by Qualstar to Interlink	(145)	(151)
Due from Qualstar, end balance	115	1
Due to Qualstar
Due to Qualstar, beginning balance	34	12
Billed (or accrued) to Interlink by Qualstar	31	33
Paid by Interlink to Qualstar	(58)	(38)
Due to Qualstar, end balance	7	7
BKF Capital
Due to Qualstar
Revenue from related parties	2	0
Receivable from related party	$ 0	$ 0

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Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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