The per share amount of a dividend declared, but not paid, as of the financial reporting date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Name:	us-gaap_DividendsPayableAmountPerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Dividends and Distribution Payable (Details Textual) - $ / shares	Dec. 31, 2017	Dec. 05, 2017	Dec. 31, 2016	Dec. 31, 2015
Dividends Payable [Line Items]
Dividends Payable, Amount Per Share (in dollars per share)	$ 2.025		$ 1.920	$ 1.845
Agree Limited Partnership [Member]
Dividends Payable [Line Items]
Dividends Payable, Amount Per Share (in dollars per share)		$ 0.520