INCOME TAXES - Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Allowance for doubtful accounts	$ 1,784	$ 1,657
Inventory	7,073	3,254
Research and development credit carryforward	8,407	1,361
Foreign tax credit carryforward	64	64
Net operating loss carryforward	802	812
Capital loss carryforward	12,813	12,363
Deferred compensation	540	0
Accruals	5,690	4,077
Investment in partnerships	319	500
Other	312	0
Total deferred tax assets	37,804	24,088
Less valuation allowance	(12,813)	(12,363)
Total deferred tax asset, net of valuation deferred tax liabilities :	24,991	11,725
Goodwill	(8,570)	(8,459)
Intangibles	(8,512)	(2,051)
Property and equipment	(7,569)	(8,319)
ROU asset and liability	(323)	0
Unremitted foreign earnings	(421)	(421)
Deferred compensation	0	(317)
Method changes	(754)	(1,961)
Other	(619)	(69)
Net deferred tax liability	$ (1,777)	$ (9,872)

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