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STOCK-BASED COMPENSATION - Non-Qualified Stock Option Award Activity (Details) - Amended and Restated 2010 Equity Incentive Plan - Stock Option Awards - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Shares    
Outstanding (in shares) 80,000  
Exercised (in shares) 0  
Outstanding (in shares) 80,000 80,000
Exercisable (in shares) 80,000 80,000
Weighted Average Exercise Price (in dollars per share)    
Outstanding (in dollars per share) $ 55.63  
Outstanding (in dollars per share) 55.63 $ 55.63
Exercisable (in dollars per share) $ 55.63 $ 55.63
Weighted Average Remaining Contractual Term    
Outstanding 4 years 9 months 3 days  
Exercisable 4 years 9 months 3 days 6 years 6 months
Stock-based compensation    
Aggregate Intrinsic Value, Exercisable (in dollars)   $ 25,000
Unrecognized compensation cost (in dollars) $ 0