Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 27,761,000	$ 16,716,000
Depreciation, Depletion and Amortization	841,000	627,000
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Share-based compensation expense	2,583,000	1,734,000
Earnest Money Deposits and Pre-acquisition Costs Written-Off	43,000	3,440,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	0
Income (Loss) from Equity Method Investments	(3,891,000)	(2,565,000)
Distributions of income from unconsolidated entities	1,886,000	1,657,000
Changes in operating assets and liabilities:
Increase in receivables	(2,337,000)	(1,301,000)
Increase in inventory	(76,034,000)	(16,884,000)
Increase in earnest money deposits	(1,009,000)	(7,436,000)
Increase in other assets	(106,000)	(1,595,000)
Increase in accounts payable	(14,479,000)	(1,288,000)
Increase in accrued expenses	9,819,000	6,850,000
Increase (Decrease) in Contract with Customer, Liability	(17,942,000)	1,369,000
Net cash (used in) provided by operating activities	(8,023,000)	1,162,000
Cash flows from investing activities:
Purchase of property and equipment	(730,000)	(1,054,000)
Net cash used in investing activities	(739,000)	(1,054,000)
Cash flows from financing activities:
Borrowings from lines of credit	108,000,000	126,000,000
Proceeds from Unsecured Notes Payable	125,000,000	0
Repayments of Lines of Credit	211,000,000	48,000,000
Payment, Tax Withholding, Share-based Payment Arrangement	834,000	592,000
Contributions of LLC Members	0	400,000
Payments to Noncontrolling Interests	0	2,970,000
Net cash provided by financing activities	18,565,000	74,838,000
9803000	9,803,000	74,946,000
Cash and cash equivalents, beginning of period		33,269,000
Restricted cash, beginning of period	14,156,000	4,416,000
Cash and cash equivalents and restricted cash, beginning of period	33,635,000	37,685,000
Cash and cash equivalents, end of period		105,860,000
Restricted cash, end of period	14,750,000	6,771,000
Cash and cash equivalents and restricted cash, end of period	43,438,000	112,631,000
Supplemental Cash Flow Information [Abstract]
Income Taxes Paid, Net	0	(137,000)
Earnest Money Deposits and Pre-acquisition Costs Written-Off	43,000	3,440,000
Repayments of Notes Payable	(2,006,000)	0
Payments of Debt Issuance Costs	(595,000)	0
Payments to Acquire Equity Method Investments	$ 9,000	$ 0