Marketable Securities (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Marketable securities at fair value	$ 78,079		$ 116,186
Percentage of undepreciated assets	6.30%
Purchase of marketable securities	$ 486	$ 509
Increase (decrease) in fair value of marketable securities	$ (38,593)	$ 8,596
Real Estate Investment Trusts [Member]
Maximum percentage of undepreciated assets	15.00%
Total net unrealized holding gains (losses)	$ 63,800
Monmouth Real Estate Investment Corporation [Member]
Marketable securities at fair value	$ 31,500
Number of common stock owned, shares	2,600,000
Number of common stock owned, value	$ 24,400
Monmouth Real Estate Investment Corporation [Member] \| Stock Purchase Plan [Member]
Purchase of common stock	39,000
Purchase of common stock, value	$ 437
Weighted average cost per shares	$ 11.20

Maximum percentage of undepreciated assets.

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Number of common stock owned, shares.

+ References

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Number of common stock owned, value.

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Percentage of undepreciated assets.

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- Definition

Purchase of common stock.

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Purchase of common stock, value.

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- Definition

The change during the period, either increase or decrease, in total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale that are pledged to one or more secured parties who have the right to buy, sell, or re-pledge the collateral.

+ References

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Amount of investment in marketable security.

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Amount, after tax and before adjustment, of unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of cash outflow for purchase of marketable security.

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Per share weighted-average price paid for shares purchased on open market for issuance under share-based payment arrangement.

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