Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual)			1 Months Ended	3 Months Ended		9 Months Ended	12 Months Ended
		May 08, 2020 $ / shares shares	Jan. 31, 2018	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2020	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Public Float Value				$ 46,000,000.0
Restricted Cash, Total							$ 180,000	$ 117,000	$ 269,000
Inventory Write-down							19,000,000	10,200,000	10,000,000
Abandoned Project Costs							14,098,000	94,000	206,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance							197,442,000	232,759,000	240,030,000		$ 264,080,000
Deferred Costs, Total	[1]						5,895,000	7,148,000
Nonrefundable Cash Deposits							8,900,000
Equity Method Investment, Impairment of Joint Ventures							0	70,000,000.0	28,776,000
Equity Method Investment, Impairment of Joint Venture Allocated to Company							$ 0	3,500,000	18,900,000
Period of General Warranty (Year)							1 year
Accounts Receivable, Allowance for Credit Loss, Ending Balance							$ 0	0
Capitalized Selling and Marketing Cost, Amortization Period (Month)							30 months
Depreciation, Total							$ 6,721,000	8,957,000	$ 6,631,000
Deferred Tax Assets, Valuation Allowance, Total							20,000	$ 0
Income Tax Examination, Penalties and Interest Accrued, Total							$ 0
Stock Repurchased and Retired During Period, Shares (in shares) | shares							2,160,792	153,916	1,003,116
Stock Repurchased and Retired During Period, Value							$ 4,279,000	$ 1,042,000	$ 8,563,000
Stock Repurchased and Retired During Period, Less Commissions, Value									8,500,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount							$ 9,400,000
Dividend, Declared, Preferred Stock Purchase Right Per Common Share (in shares) | shares		1
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares		$ 0.01					$ 0.01	$ 0.01
Preferred Stock Purchase Right, Exercise Price (in dollars per share) | $ / shares		$ 11.50
Dividends, Common Stock, Total							$ 0	$ 0	0
Defined Contribution Plan, Employer Matching Contribution, Percent of Match							50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay							8.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount							$ 11,400
Defined Contribution Plan, Employer Discretionary Contribution Amount							1,000,000.0	1,000,000.0	1,000,000.0
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance							5,765,000	38,584,000	46,621,000		64,307,000
Stock Repurchased and Retired During Period, Value							(0)	(0)	123,000
Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance							191,496,000	193,862,000	193,132,000		199,474,000
Stock Repurchased and Retired During Period, Value							4,257,000	1,040,000	8,430,000
Unconsolidated Joint Ventures [Member]
Equity Method Investment, Other than Temporary Impairment				$ 20,000,000.0	$ 2,300,000		$ 22,300,000	$ 0	$ 1,100,000
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)							5 years
Maximum [Member] | Unconsolidated Joint Ventures [Member]
Equity Method Investment, Ownership Percentage							35.00%
Minimum [Member]
Limited Warranty Period (Year)						2 years
Property, Plant and Equipment, Useful Life (Year)							3 years
Minimum [Member] | Unconsolidated Joint Ventures [Member]
Equity Method Investment, Ownership Percentage							10.00%
Customer Concentration Risk [Member] | Fee Building Revenue [Member]
Number of Major Customers			1				1	1
Concentration Risk, Percentage							91.00%	95.00%	95.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Major Customers							1	1
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage							35.00%	65.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Separate Fee Building Customer [Member]
Concentration Risk, Percentage							25.00%	0.00%
Accounting Standards Update 2014-09 [Member]
Deferred Costs, Total										$ 4,700,000
Deferred Tax Assets, Gross, Total										1,300,000
Cumulative Effect, Period of Adoption, Adjustment [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance											(3,365,000)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance											(3,347,000)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance											$ (18,000)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2014-09 [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance										3,400,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-07 [Member] | Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance										18,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-07 [Member] | Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance										$ (18,000)

[1] Capitalized selling and marketing costs includes costs incurred for tangible assets directly used in the sales process such as our sales offices, design studios and model furnishings, and also includes model landscaping costs, which were $2.2 million and $2.6 million as of December 31, 2020 and 2019, respectively. The Company depreciated $6.5 million and $8.7 million, of capitalized selling and marketing costs to selling and marketing expenses during the years ended December 31, 2020 and 2019, respectively.