INCOME PROPERTIES AND LEASES - Property disposed (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales price	$ 51,576,910	$ 82,647,778
Gain (Loss) on Sale	$ 7,718,553	$ 20,805,819
EPS, After Tax	$ 1.25	$ 3.07
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
Wawa, Daytona Beach, FL [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales price	$ 6,002,400
Gain (Loss) on Sale	$ 1,768,603
EPS, After Tax	$ 0.29
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
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)
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
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
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
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
Wawa, Jacksonville, FL [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales price	$ 7,143,000
Gain (Loss) on Sale	$ 245,696
EPS, After Tax	$ 0.04
Wawa, Winter Park, FL [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales price		$ 2,777,778
Gain (Loss) on Sale		$ 2,123,955
EPS, After Tax		$ 0.33
Carrabbas, Austin, TX [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales price	$ 2,554,772
Gain (Loss) on Sale	$ (83,834)
EPS, After Tax	$ (0.01)
PDQ, Jacksonville, FL [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sales price	$ 2,540,000
Gain (Loss) on Sale	$ 127,874
EPS, After Tax	$ 0.02