Note 11 - Commitments and Contingencies (Details Textual) $ in Thousands		12 Months Ended
		Dec. 31, 2020 USD ($) ft² a	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Estimated Litigation Liability		$ 5,600	$ 10,900
Insurance Settlements Receivable	[1]	4,816	10,900
Proceeds from Insurance Settlement, Operating Activities		4,700
Operating Lease, Right-of-Use Asset		2,997	1,988
Short-term Lease, Cost		200	800
Sublease Income		$ 200	$ 200
Operating Lease, Weighted Average Remaining Lease Term (Year)		4 years 2 months 12 days	1 year 10 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent		3.70%	4.40%
Corporate Headquarters [Member]
Area of Real Estate Property (Square Foot) | ft²		13,000
Divisional Offices [Member]
Area of Real Estate Property (Square Foot) | ft²		19,500
Area of Real Estate Property, Sublet (Acre) | a		7,700
Leases for Office Facilities [Member]
Operating Lease, Expense		$ 1,200	$ 1,200	$ 1,100
Accrued Liabilities and Other Liabilities [Member]
Estimated Litigation Liability	[2]	5,641	10,900
Operating Lease, Liability, Total		3,180	2,243
Surety Bond [Member]
Loss Contingency, Range of Possible Loss, Portion Not Accrued		44,000	47,600
Loss Contingency, Estimated Remaining Costs of Work to be Completed		16,300	29,100
Corporate Joint Venture [Member] | Loans Payable [Member]
Related Party Transaction, Guarantor Obligations Underlying Asset Class, Guaranteed		0	5,800
Corporate Joint Venture [Member] | Financial Guarantee [Member]
Long-term Debt, Gross		0	28,600
Ordinary Course Litigation [Member]
Estimated Litigation Liability			5,900
Increase (Decrease) in Litigation Reserve		(200)
Increase (Decrease) in Insurance Settlements Receivable		(200)
IBNR Construction Defect Claims [Member]
Estimated Litigation Liability			$ 5,000
Increase (Decrease) in Litigation Reserve		(400)
Decrease Adjustment to Litigation Reserve		(1,000)
Increase (Decrease) in Insurance Settlements Receivable		(1,200)
IBNR Construction Defect Claims [Member] | Cost of Sales [Member]
Expense Recorded Related to Additional Self-insured Retention Deductibles		$ 600

[1] The Company recorded insurance receivables of $10.9 million in connection with $10.9 million of litigation reserves recorded as of December 31, 2019. During 2020, $4.7 million was paid by our insurance carrier directly to claimants related to two claims, and the Company reduced its insurance receivable estimate by $0.2 million for one claim and adjusted the incurred but not reported ("IBNR") litigation reserve by $1.2 million, resulting in an insurance receivable balance of $4.8 million at December 31, 2020 with a corresponding decrease recorded within litigation reserves and $0.2 million charged to cost of sales. For more information, please refer to Note 8.

[2] During 2019, we recorded litigation reserves totaling $5.9 million related to ordinary course litigation which developed and became probable and estimable within the 2019 fourth quarter. Further, as a result of the development of the construction defect related claims within the litigation reserve and their impact to the Company's litigation reserve estimates for IBNR future construction defect claims, we recorded an additional $5.0 million of IBNR construction defect claim reserves resulting in aggregate litigation reserves totaling $10.9 million as of December 31, 2019. Because the self-insured retention deductibles had been met for each claim covered by the $5.9 million reserve, and the self-insured retention deductibles are expected to be met for the $5.0 million IBNR construction defect claim reserves, the Company recorded estimated insurance receivables of $10.9 million offsetting the litigation reserves as of December 31, 2019. During the year ended December 31, 2020, $4.7 million was paid by our insurance carrier directly to claimants related to two claims, and the Company decreased its litigation reserve estimate by $0.2 million for one claim and decreased the IBNR litigation reserve by a net $0.4 million ($1.0 million corresponding decrease in insurance receivables, and a $0.6 million increase in cost of sales) resulting in a litigation reserve balance of $5.6 million at December 31, 2020.