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Nature of Operations, Accounting Policies of Consolidated Financial Statements - Additional Information (Detail) - USD ($)
 12 Months Ended
May 31, 2017
May 31, 2016
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]    
Impairment of long-lived assets $ 0  
Stock options outstanding 274,000 225,000
Stock options granted 49,000 225,000
Interest paid $ 241,000 $ 237,000
2015 Stock Incentive Plan [Member]    
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]    
Stock options outstanding 274,000  
Stock options granted 225,000  
Home Sales [Member]    
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]    
Product warranty 15 months  
Building and Improvements [Member] | Minimum [Member]    
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]    
Estimated useful lives of property, plant and equipment 10 years  
Building and Improvements [Member] | Maximum [Member]    
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]    
Estimated useful lives of property, plant and equipment 30 years  
Machinery and Equipment [Member] | Minimum [Member]    
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]    
Estimated useful lives of property, plant and equipment 5 years  
Machinery and Equipment [Member] | Maximum [Member]    
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]    
Estimated useful lives of property, plant and equipment 8 years