Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) shares	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Segment shares	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Federal Deposit Insurance Corporation protection limits	$ 250,000		$ 250,000
Un-amortized franchise fees	486,865		486,865		$ 532,070
Amortization expense	14,868	$ 11,217	45,204	$ 35,299
Amortization expense on favorable lease assets, net	94,823		221,256
Deferred income taxes	4,700,379		4,700,379		5,451,118
Deferred tax assets related to net operating losses	4,200,000		$ 4,200,000		4,900,000
Minimum percentage of likelihood of realization of deferred tax assets			50.00%
Deferred tax assets valuation allowance	0		$ 0
Uncertain tax positions	0		0		$ 0
Compensation cost recognized			313,540	282,237
Advertising cost	88,154	101,788	334,271	251,892
Gain on involuntary conversion of assets	0	0	$ 898,565	1,041,815
Number of reportable segment | Segment			1
Director [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares issued but not vested | shares			15,000
Shares award vesting date			Dec. 31, 2018
2004 Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares issued under plan | shares			337,438
Termination year of stock based compensation plan			2013
2004 Plan [Member] | Executives and Employees [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares issued under plan | shares			255,938
2004 Plan [Member] | Director [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares issued under plan | shares			81,500
Stock-based Compensation , Number of Shares, Vested | shares			81,500
2013 Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares issued under plan | shares			163,350
Performance-based stock awards granted | shares			0
2013 Plan [Member] | Executives and Employees [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares issued under plan | shares			77,600
2013 Plan [Member] | Director [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares issued under plan | shares			85,750
2013 Plan [Member] | One Employee [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares issued but not vested | shares			25,000
Stock award vesting period			5 years
2004 and 2013 Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Compensation cost recognized	8,025	4,980	$ 127,402	104,100
Other Operating Departments [Member]
Summary Of Significant Accounting Policies [Line Items]
Lease revenue	$ 300,000	$ 400,000	$ 1,200,000	$ 1,300,000
Maximum [Member] | 2004 Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted, unrestricted and performance stock awards permitted to grant to employees | shares	350,000		350,000
Maximum [Member] | 2013 Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted, unrestricted and performance stock awards permitted to grant to employees | shares	750,000		750,000
Buildings and Building Improvements [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of the assets			7 years
Buildings and Building Improvements [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of the assets			39 years
Furniture, Fixtures and Equipment [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of the assets			3 years
Furniture, Fixtures and Equipment [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of the assets			10 years