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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]      
Effective tax rate computed at the statutory federal rate 21.00% 21.00% 35.00%
Additional tax expense related to new corporate tax rate reform     $ 4,752,547
Reclassification of an alternative minimum tax credit carry forward     $ 8,500,000
Net operating loss carryback period 2 years    
Operating loss carryforwards expiration period 2038    
Other deferred tax assets, net $ 26,100,000 $ 32,400,000  
Parent Company [Member]      
Operating Loss Carryforwards [Line Items]      
Valuation allowance related to the portion of operating loss carryforwards 7,500,000 $ 8,100,000  
Earliest Tax Year [Member]      
Operating Loss Carryforwards [Line Items]      
Tax years open for examination   2016  
Latest Tax Year [Member]      
Operating Loss Carryforwards [Line Items]      
Tax years open for examination   2019  
Le Mars [Member]      
Operating Loss Carryforwards [Line Items]      
Valuation allowance related to the portion of operating loss carryforwards 18,033 $ 18,033  
Operating loss carryforwards $ 956,865    
Operating loss carryforwards expiration period 2020    
Operating loss carryforwards annual limitations in amount on use $ 376,000