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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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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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