FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents Fair Value Disclosure	$ 2,814	$ 2,799
Equity Securities, FV-NI	500	823
Marketable Securities	2,122	10,308
Debt Securities, Trading, and Equity Securities, FV-NI	108	116
Assets, Fair Value Disclosure	5,544	14,046
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent	112	116
Financial and Nonfinancial Liabilities, Fair Value Disclosure	112	116
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents Fair Value Disclosure	2,814	2,799
Equity Securities, FV-NI	500	823
Marketable Securities	2,122	10,308
Debt Securities, Trading, and Equity Securities, FV-NI	108	116
Assets, Fair Value Disclosure	5,544	14,046
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent	112	116
Financial and Nonfinancial Liabilities, Fair Value Disclosure	112	116
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents Fair Value Disclosure	0	0
Equity Securities, FV-NI	0	0
Marketable Securities	0	0
Debt Securities, Trading, and Equity Securities, FV-NI	0	0
Assets, Fair Value Disclosure	0	0
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents Fair Value Disclosure	0	0
Equity Securities, FV-NI	0	0
Marketable Securities	0	0
Debt Securities, Trading, and Equity Securities, FV-NI	0	0
Assets, Fair Value Disclosure	0	0
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 0	$ 0