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Dividend on Common Stock (Details) - USD ($)					6 Months Ended
	Jul. 21, 2017	May 17, 2017	Apr. 17, 2017	Mar. 28, 2017	Jun. 30, 2017	Jun. 30, 2016	Apr. 25, 2017
Subsequent Event [Line Items]
Common stock, dividend rate, declared				1.00%
Additional number of shares issued to shareholders (in shares)			167,082
Amount transferred from retained earnings to common stocks based on closing price on declaration date				$ 1,219,759
Closing price of common stock on declaration date (in dollars per share)				$ 7.38
Percentage of stock dividend declared on common stocks outstanding (in hundredths)					1.00%
Dividends declared on common stock (in dollars per share)		$ 0.05			$ 100.00
Dividends on common stock		$ 846,000			$ 846,000	$ 0
Authorized repurchase amount, common stock							$ 3,000,000
Subsequent event
Subsequent Event [Line Items]
Dividends declared on common stock (in dollars per share)	$ 0.05
Dividends on common stock	$ 844,000

X

- Definition

This element represents value of shares transferred from retained earning to common stock based on closing price on declaration date.

+ References

No definition available.

+ Details

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X

- Definition

Closing price per share amount for each share of common stock offered in the stock market on declaration date.

+ References

No definition available.

+ Details

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X

- Definition

Common Stock, Dividend Rate, Declared

+ References

No definition available.

+ Details

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- Definition

Percentage of stock dividends for common shareholders declared by an entity during the period.

+ References

No definition available.

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X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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

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X

- Definition

Number of shares of common stock issued as dividends during the period. Excludes stock splits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

Amount of stock repurchase plan authorized.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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