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Treasury Stock - Additional Information (Details) - USD ($)		1 Months Ended	12 Months Ended		17 Months Ended
	Aug. 07, 2018	Aug. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018
Equity Class Of Treasury Stock [Line Items]
Stock repurchase, cost			$ 2,174,430	$ 1,257,100
Common Stock
Equity Class Of Treasury Stock [Line Items]
Stock repurchase, shares			222,314	135,000
Common Stock | Share Repurchase Program August 2017
Equity Class Of Treasury Stock [Line Items]
Stock approved for repurchase, value		$ 7,000,000
Period of stock repurchase program		12 months
Additional period of stock repurchase program	12 months
Stock repurchase, shares			222,314	135,000	357,314
Stock repurchase, average price per share			$ 9.92	$ 9.40	$ 9.60
Stock repurchase, cost			$ 2,174,430	$ 1,257,100	$ 3,431,530

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