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DISCONTINUED OPERATIONS (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating results for apartment complex:      
Rental revenue $ 1,271
Operating expenses (844)
Net earnings for apartment complex 427
Operating expenses of mining segment:      
Water treatment plant $ (1,737) $ (1,875) (1,817)
Mine property holding costs (1,134) (1,110) (1,228)
Depreciation of mine equipment (122) (123) (126)
Total expenses for mining segment (2,993) (3,108) (3,171)
Total results for discontinued operations $ (2,993) $ (3,108) $ (2,744)