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Summary of Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Mar. 31, 2018
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Deferred Tax Liabilities, Gross | $ 475 |  | $ 475 |  | $ 475 |  | $ 475 |
Income Tax Expense (Benefit) |  |  | 125 | $ 37 | 391 | $ 366 |  |
Deferred Rent Receivables, Net | 15,500 |  | 15,500 |  | 15,500 |  | 12,900 |
Cash in Excess of FDIC Insured Amounts | $ 17,300 |  | $ 17,300 |  | $ 17,300 |  | $ 57,500 |
Weighted Average Number Diluted Shares Outstanding Adjustment |  |  | 448,217 |  | 267,867 |  |  |
Common Stock, Shares Authorized | 45,000,000 |  | 45,000,000 |  | 45,000,000 |  | 45,000,000 |
Reimbursements Revenue |  |  |  |  | $ 2,500 |  | $ 1,400 |
Proceeds from Issuance of Common Stock |  | $ 108,000 |  |  | $ 159,604 | $ 136,733 |  |
Forward Contracts Two [Member] |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Share Price | $ 55.20 |  | $ 55.20 |  | $ 55.20 |  |  |
Common Stock, Shares Authorized | 3,500,000 |  | 3,500,000 |  | 3,500,000 |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Share Price |  |  |  |  |  |  |  | $ 48.00
Stock Issued During Period, Shares, New Issues |  | 2,415,000 |  |  | 3,450,000 |  |  |
Proceeds from Issuance of Common Stock | $ 160,200 |  |  |  | $ 190,000 |  |  |
Common Stock [Member] | Forward Contracts [Member] |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  | 3,450,000
Stock Issued During Period, Shares, New Issues |  |  |  |  | 3,450,000 |  |  |
Over-Allotment Option [Member] | Common Stock [Member] | Forward Contracts [Member] |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  | 450,000

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