INVESTMENT SECURITIES - General Information (Details) - USD ($)		3 Months Ended		9 Months Ended
	Nov. 26, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Marketable Securities [Line Items]
Purchase price of shares		$ 73,470	$ 79,275	$ 424,400	$ 442,520
Estimated Fair Value (Level 1 and 2 Inputs)		$ 31,716,464		$ 31,716,464		$ 38,814,425
Increase (decrease) in closing stock price		$ 0.71		$ 3.48
Closing share price (in dollars per share)		15.55		15.55
After tax value of non-cash		$ 0.23		$ 1.14
Unrealized, non-cash gain on investment		$ 1,400,000		$ 7,100,000
Alpine
Marketable Securities [Line Items]
Share purchased	2,040,000.00
Units issued	2,040,000.00
Percentage of investment in PINE	23.50%	23.50%		23.50%
Estimated Fair Value (Level 1 and 2 Inputs)	$ 38,800,000	$ 31,700,000		$ 31,700,000
Alpine | OP Units
Marketable Securities [Line Items]
Share purchased	1,223,854
Units issued	1,223,854
Private placement | Alpine
Marketable Securities [Line Items]
Share purchased	394,737
Purchase price of shares	$ 7,500,000
Units issued	394,737
IPO Purchase | Alpine
Marketable Securities [Line Items]
Share purchased	421,053
Purchase price of shares	$ 8,000,000.0
Units issued	421,053