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EQUITY INCENTIVES - Stock Options and Stock Appreciation Rights (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2016
May 31, 2010
Dec. 31, 2019
Dec. 31, 2018
Equity incentives          
Increase in number of shares authorized 6,500,000 5,000,000 4,500,000    
Authorized shares 21,100,000   9,600,000    
Shares available for issuance       3,924,920  
Total unrecognized compensation cost related to share-based compensation arrangements       $ 300,000  
Expected weighted-average recognition period in years       2 years 2 months 12 days  
Contractual term       5 years  
Maximum          
Equity incentives          
Vesting period       3 years  
2006 Equity Incentive Plan          
Equity incentives          
Authorized shares   14,600,000      
Stock Options and Stock Appreciation Rights          
Equity incentives          
Contractual term       5 years  
Aggregate intrinsic value of outstanding and exercisable       $ 0  
Weighted average remaining contractual term of outstanding and exercisable       1 year 10 months 24 days  
Total intrinsic value of options exercised       $ 0 $ 0
Stock Options and Stock Appreciation Rights | Minimum          
Equity incentives          
Vesting period       0 years  
Stock Options and Stock Appreciation Rights | Maximum          
Equity incentives          
Vesting period       3 years