Dividend Payment (Details Textual) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	6 Months Ended
Mar. 20, 2017	Jul. 15, 2017
Dividend Payment Terms [Line Items]
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 0.115	$ 0.115
Dividends, Common Stock, Cash (in dollars)	$ 1.6	$ 1.7

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Name:	us-gaap_DividendsCommonStockCash
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration