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Treasury Stock - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2017	Mar. 31, 2018	Dec. 31, 2017
Equity Class Of Treasury Stock [Line Items]
Common stock repurchase, value		$ 2,000,000
Common Stock
Equity Class Of Treasury Stock [Line Items]
Stock repurchase, shares			135,000
Common Stock | Share Repurchase Program August 2017
Equity Class Of Treasury Stock [Line Items]
Stock repurchase, shares		86,168
Stock repurchase, average price per share		$ 9.06
Stock repurchase, cost		$ 779,913
Common Stock | Board of Directors | Share Repurchase Program August 2017
Equity Class Of Treasury Stock [Line Items]
Stock approved for repurchase, value	$ 7,000,000
Period of stock repurcahse program	12 months

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Amount of stock repurchase plan authorized.

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares that have been repurchased during the period and are being held in treasury.

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