Nature of Operations and Summary of Significant Accounting Policies (Schedule Of Amortizable Classification Of Intangible Assets) (Details)	12 Months Ended
	Dec. 31, 2019
Home Plans [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets	7 years
Minimum | Home Construction Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets	1 year
Minimum | Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets	2 years
Maximum | Home Construction Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets	2 years
Maximum | Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets	5 years