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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2018
USD ($)
Segment
shares
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Federal Deposit Insurance Corporation protection limits | $ $ 250,000    
Un-amortized franchise fees | $ 516,601   $ 532,070
Amortization expense | $ 17,032 $ 31,452  
Lease revenue | $ 500,000 500,000  
Deferred income taxes | $ 5,190,855   5,451,118
Deferred tax assets related to net operating losses | $ $ 4,600,000   4,900,000
Minimum percentage of likelihood of realization of deferred tax assets 50.00%    
Deferred tax assets valuation allowance | $ $ 0    
Uncertain tax positions | $ 0   $ 0
Compensation cost recognized | $ 171,523 94,140  
Advertising cost | $ 98,313 65,010  
Gain on involuntary conversion of assets | $ $ 870,741 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  
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    
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    
Buildings and Improvements [Member] | Minimum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful lives of the assets 7 years    
Buildings and 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