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