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SALES OF PROPERTIES (Details) - USD ($) |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 11, 2020 | Dec. 10, 2019 | Aug. 23, 2019 | Jun. 20, 2019 | Jan. 30, 2018 | Nov. 14, 2017 | Jul. 14, 2017 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 14, 2018 | Nov. 30, 2017
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  | $ 41,891,000 | $ 27,659,000 | $ 27,050,000 |  |
Real estate investments, net |  |  |  |  |  |  |  |  | 700,535,000 | 705,459,000 |  |  |
Gain (Loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  | 4,327,000 | 5,262,000 | 9,837,000 |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  | 153,000 |  |
Mortgage paid off |  |  |  |  |  |  |  |  | 19,970,000 | 24,502,000 | 12,936,000 |  |
Kmart retail property, Clemmons, North Carolina |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  | 5,500,000 |  |  |  |
Gain (Loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  | 1,099,000 |  |  |  |
Multi-tenant retail property, Athens, Georgia |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  | 6,050,000 |  |  |  |
Gain (Loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  | 1,045,000 |  |  |  |
Prepayment costs on debt related to a swap termination fee |  |  | $ 161,000 |  |  |  |  |  |  |  |  |  |
Land - The Briarbrook Village Apartments, Wheaton, Illinois |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  | 12,066,000 |  |  |  |
Gain (Loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  | 1,530,000 |  |  |  |
Aaron's retail property, Houston, Texas |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  | 1,675,000 |  |  |  |
Gain (Loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  | 218,000 |  |  |  |
Assisted living facility, Round Rock, Texas |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  | 16,600,000 |  |  |  |
Gain (Loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  | $ 435,000 |  |  |  |
Prepayment costs on debt related to a swap termination fee |  | $ 625,000 |  |  |  |  |  |  |  |  |  |  |
Multi-tenant retail property, Fort Bend, Texas |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  | 9,200,000 |  |  |
Gain (Loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  | 2,408,000 |  |  |
Land - The Meadows Apartments, Lakemoor, Illinois |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  | 8,459,000 |  |  |
Gain (Loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  | 4,585,000 |  |  |
Unamortized balance, fixed rent |  |  |  |  |  |  |  |  |  |  |  | $ 5,717,000 |
Deferred income |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,906,000
Shopko retail property, Lincoln, Nebraska |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |
Gain (Loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  | $ (1,731,000) |  |  |
Former Sports Authority retail property, Greenwood Village, Colorado |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  | 9,500,000 |  |
Gain (Loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  |  | 6,568,000 |  |
Kohl's retail property, Kansas City, Missouri |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  | 10,250,000 |  |
Gain (Loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  |  | 2,180,000 |  |
Prepayment costs on debt related to a swap termination fee |  |  |  |  |  |  | $ 131,000 |  |  |  |  |  |
Former hhgregg retail property, Niles, Illinois |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |
Gain (Loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  |  |  |  | 1,089,000 |  |
Joe's Crab Shack restaurant property, Ann Arbor, Michigan |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  | $ 2,300,000 |  |
Impairment loss |  |  |  |  |  | $ 153,000 |  |  |  |  |  |  |
Prepayment costs on debt related to a swap termination fee |  |  |  |  |  | $ 70,000 |  |  |  |  |  |  |
Retail property, Onalaska, Wisconsin |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Real Estate, Net |  |  |  |  |  |  |  | $ 4,250,000 |  |  |  |  |
Proceeds from sale of real estate, net of closing costs | $ 7,093,000 |  |  |  |  |  |  |  |  |  |  |  |
Repayment of debt cost | 290,000 |  |  |  |  |  |  |  |  |  |  |  |
Mortgage paid off | $ 3,332,000 |  |  |  |  |  |  |  |  |  |  |  |
Retail property, Onalaska, Wisconsin | Rental income, net | Geographic concentration |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  |  | 1.00% | 1.00% | 1.00% |  |
Consolidated Joint Venture | Kmart retail property, Clemmons, North Carolina |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in consolidated joint venture of the company (as a percent) |  |  |  | 90.00% |  |  |  |  |  |  |  |  |
Prepayment costs on debt related to a swap termination fee |  |  |  | $ 41,000 |  |  |  |  |  |  |  |  |
Non-controlling interest's share of the gain |  |  |  | $ 422,000 |  |  |  |  |  |  |  |  |
Consolidated Joint Venture | Multi-tenant retail property, Fort Bend, Texas |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in consolidated joint venture of the company (as a percent) |  |  |  |  | 85.00% |  |  |  |  |  |  |  |
Non-controlling interest's share of the gain |  |  |  |  | $ 776,000 |  |  |  |  |  |  |  |

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