Business Combination (Narrative) (Details) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Assets acquired
Goodwill	$ 680,000			$ 680,000		$ 680,000
Liabilities assumed
Homebuilding revenues	373,806,000		$ 232,833,000	608,285,000	$ 446,100,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	73,977,000		36,185,000	109,239,000	58,941,000
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	742,000		686,000	1,071,000	1,242,000
Temporary Equity, Accretion to Redemption Value				(3,007,000)	(863,000)
Payment for Contingent Consideration Liability, Operating Activities				(368,000)	(5,267,000)
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount	17,515,000		12,485,000	17,515,000	12,485,000	13,543,000	$ 15,701,000	$ 13,611,000	$ 11,412,000
Payments for Repurchase of Redeemable Noncontrolling Interest	(106,000)		(1,505,000)	(106,000)	$ (1,505,000)
Noncontrolling Interest, Change in Redemption Value	$ 1,178,000		$ 1,892,000	$ (3,007,000)
Contingent Consideration Earned						$ 0.4
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid		$ 0.1
GHO Homes [Member]
Liabilities assumed
Ownership percentage by noncontrolling owners	20.00%			20.00%