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COMMITMENTS, CONTINGENCIES AND OTHER (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Water Rights Litigation Mt. Emmons Project [Abstract]      
Period for proposal submission 6 years    
401(K) Plan [Abstract]      
Matching percentage on an employee's salary deferrals (in hundredths) 50.00%    
Maximum matching on an employee's salary deferrals $ 4,000    
401 (k) expense 54,000 57,000 49,000
Assumptions [Line Items]      
Number of executives included in the plan 2    
Mandatory retirement age 70 years    
Number of employees with agreements for payment of severance in event of change of control 1    
Leases, Operating [Abstract]      
Operating Leases, Minimum Payments Receivable, Monthly 8,000    
Rental income under the agreements 170,000 101,000 98,000
Future minimum receipts for non-cancelable operating leases 77,000    
Executive Officers [Member]
      
Assumptions [Line Items]      
Shares authorized under the plan per each officer (in shares) 20,000    
Shares issued under the plan (in shares) 60,000 75,000 80,000
Period used to compute supplemental retirement salary 5 years    
Minimum years of service for eligibility in plan (in years) 15 years    
Minimum age requirement 60 years    
Value of executive retirement account funded 1,000,000    
Compensation expense 80,000 72,000 314,000
Accrued liability for executive retirement 903,000 947,000 1,000,000
Surviving spouse of the former Chairman and Founder [Member]
      
Assumptions [Line Items]      
Number of years salary to be paid under the plan 1 year    
Percentage of final salary of wages to be paid in supplemental board approved plan 50.00%    
Number of years the plan covers a portion of salary 4 years    
Distributions paid 0 57,000 85,000
Former General Counsel [Member]
      
Assumptions [Line Items]      
Annual payment 85,000    
Former CFO/Treasurer/V.P. Finance [Member]
      
Assumptions [Line Items]      
Distributions paid $ 122,000 $ 50,000