Fair Value Measurements (Details Narrative) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) integer	Dec. 31, 2017 USD ($)
Unrealized loss on corporate bonds	$ 1,014
Realized loss on corporate bonds	580
Amortized cost of investments	166,226
Carrying amount of mortgage notes payable	88,789	$ 118,317
Fair value of mortgage notes payable	$ 87,983	$ 122,271
Bonds maturing 2020 through 2021
Number of corporate bonds \| integer	55
Bonds maturing 2024
Number of corporate bonds \| integer	1
Fair Value, Measurements, Recurring [Member]
Assets measured at fair value	$ 165,212

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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