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Business Combination (Schedule of Fair Value of Assets Acquired and Liabilities Assumed) (Details) - USD ($)
2 Months Ended 5 Months Ended
Sep. 30, 2018
Apr. 26, 2018
Jun. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Assets acquired          
Goodwill $ 680,000     $ 680,000 $ 0
GHO Homes          
Business Acquisition [Line Items]          
Business Combination, Consideration Transferred     $ 42,200,000 $ 44,600,000  
Assets acquired          
Cash   $ 8,399,000      
Inventory   45,070,000      
Property and equipment   1,462,000      
Goodwill   680,000      
Other assets   833,000      
Total assets   57,584,000      
Liabilities assumed          
Note payable   300,000      
Accrued expenses and other liabilities   5,486,000      
Customer deposits   9,073,000      
Total liabilities   14,859,000      
Redeemable noncontrolling interest   6,951,000      
Net assets acquired   35,774,000      
Contingent consideration $ 500,000 600,000.0      
GHO Homes | Trademarks [Member]          
Assets acquired          
Intangible assets - home construction contracts   850,000      
GHO Homes | Home Construction Contracts          
Assets acquired          
Intangible assets - home construction contracts   $ 290,000