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Earnings per Share (Detail Textuals) - Repurchase Program - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Aug. 08, 2017	Aug. 06, 2015
Class of Stock [Line Items]
Value of shares repurchased through open market transactions		$ 1.5	$ 2.0
Total number of common stock repurchased	87,041
Average price per share of total common stock repurchased	$ 17.63
Number of common stock repurchased	43,148
Average price per share of common stock repurchased	$ 20.36
Value remained available for the purchase of shares under the plan	$ 1.9

X

- Definition

Represents average price per share of common stock repurchase.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of stock repurchase plan authorized.

+ References

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- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(28))
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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Total cost of shares repurchased divided by the total number of shares repurchased.

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