INCOME PROPERTIES AND LEASES - Property disposed (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - USD ($)		6 Months Ended
	Jul. 23, 2020	Jun. 30, 2020	Jun. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales price		$ 39,339,138	$ 79,870,000
Gain (Loss) on Sale		$ 7,428,817	$ 18,681,864
EPS, After Tax		$ 1.20	$ 2.74
Exit Cap Rate		4.30%	6.19%
C V S, Dallas TX, [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales price		$ 15,222,000
Gain (Loss) on Sale		$ 854,336
EPS, After Tax		$ 0.14
Exit Cap Rate		4.50%
Wawa, Daytona Beach, FL [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales price	$ 7,100,000	$ 6,002,400
Gain (Loss) on Sale	$ 246,000	$ 1,768,603
EPS, After Tax	$ 0.04	$ 0.29
Exit Cap Rate	4.90%	4.75%
J P Morgan Chase Bank, Jacksonville FL [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales price		$ 6,714,738
Gain (Loss) on Sale		$ 959,444
EPS, After Tax		$ 0.15
Exit Cap Rate		4.15%
Seven-Eleven Dallas, TX [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales price		$ 2,400,000
Gain (Loss) on Sale		$ (45,615)
EPS, After Tax		$ (0.01)
Exit Cap Rate		6.08%
Bank Of America, Monterey, CA [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales price		$ 9,000,000
Gain (Loss) on Sale		$ 3,892,049
EPS, After Tax		$ 0.63
Exit Cap Rate		3.28%
Whole Foods, Sarasota, FL [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales price			$ 24,620,000
Gain (Loss) on Sale			$ 6,869,957
EPS, After Tax			$ 0.96
Exit Cap Rate			5.15%
The Grove, Winter Park, FL [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales price			$ 18,250,000
Gain (Loss) on Sale			$ 2,803,198
EPS, After Tax			$ 0.42
Exit Cap Rate			6.72%
3600 Peterson, Santa Clara, CA [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales price			$ 37,000,000
Gain (Loss) on Sale			$ 9,008,709
EPS, After Tax			$ 1.36
Exit Cap Rate			6.62%