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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 ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Shares      
Outstanding (in shares) 80,000 80,000  
Granted (in shares)   0  
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 $ 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   5 years 9 months 4 days  
Exercisable   5 years 9 months 4 days 6 years 6 months
Stock-based compensation      
Aggregate Intrinsic Value, Outstanding (in dollars)   $ 325,800  
Aggregate Intrinsic Value, Exercisable (in dollars)   325,800 $ 25,000
Unrecognized compensation cost (in dollars)   $ 0