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INCOME TAXES (Schedule of Deferred Income Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:        
Valuation allowance $ (24,997) $ (24,059) $ (27,062) $ (41,316)
Continuing Operations        
Deferred tax assets:        
Long-lived assets depreciation 1,665 1,352    
Deferred government subsidy 60 0    
Net operating loss carried forward 709 729    
Sub-total 2,434 2,081    
Valuation allowance (709) (729)    
Total deferred tax assets 1,725 1,352    
Deferred tax liabilities:        
Long-lived assets depreciation (4,540) (5,227)    
Difference in basis of buildings (646) (1,141)    
Total deferred tax liabilities (5,186) (6,368)    
Deferred tax liabilities, net $ (3,461) $ (6,368)