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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Stock-Based Compensation, Restricted Stock Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restricted Stock Awards
Restricted Stock Awards [Roll Forward]
Nonvested, Beginning balance (in shares)			10,450
Granted (in shares)			5,036
Vested (in shares)			(11,450)
Forfeited (in shares)			0
Nonvested, Ending balance (in shares)	4,036		4,036
Weighted-Average Grant Date Fair Value Per Share [Roll Forward]
Nonvested, Beginning of period (in dollars per share)			$ 60.47
Granted (in dollars per share)			55.71
Vested (in dollars per share)			59.60
Forfeited (in dollars per share)			0
Nonvested, Ending of period (in dollars per share)	$ 57.00		$ 57.00
Unrecognized compensation cost	$ 181		$ 181
Recognized compensation period			1 year
Restricted Stock Awards \| General and Administrative
Weighted-Average Grant Date Fair Value Per Share [Roll Forward]
Stock-based compensation expense	193	$ 0	$ 337	$ 0
Stock Options
Weighted-Average Grant Date Fair Value Per Share [Roll Forward]
Unrecognized compensation cost	4,300		$ 4,300
Recognized compensation period			8 years 1 month 6 days
Stock Options \| General and Administrative
Weighted-Average Grant Date Fair Value Per Share [Roll Forward]
Stock-based compensation expense	$ 31	$ 119	$ 136	$ 260