INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Allowance for doubtful accounts	$ 1,657	$ 1,948
Inventories	3,254	2,944
Research and development credit carryforward	1,361	775
Foreign tax credit carryforward	64	64
Net operating loss carryforward	812	610
Capital loss carryforward	12,363	12,564
Deferred compensation	0	538
Accruals	4,077	576
Investment in partnerships	500	0
Other	0	137
Total deferred tax assets	24,088	20,156
Less valuation allowance	(12,363)	(12,564)
Total deferred tax asset, net of valuation deferred tax liabilities :	11,725	7,592
Goodwill	(8,459)	(1,053)
Intangibles	(2,051)	(7,820)
Property and equipment	(8,319)	(6,807)
Unremitted foreign earnings	(421)	(421)
Deferred compensation	(317)	0
Method changes	(1,961)	0
Other	(69)	(124)
Net deferred tax liability	$ (9,872)	$ (8,633)