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DISCONTINUED OPERATIONS (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating results for apartment complex:      
Rental revenue
Operating expenses
Net earnings for apartment complex
Operating expenses of mining segment:      
Water treatment plant (254) (1,737) (1,875)
Mine property holding costs (2,194) (1,133) (1,110)
Impairment loss on discontinued operations (22,620)
Depreciation of mine equipment (122) (123)
Total expenses for mining segment (2,448) (25,612) (3,108)
Total results for discontinued operations $ (2,448) $ (25,612) $ (3,108)