Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Accrued bonuses	$ 591	$ 1,120
Accrued payroll	75	101
Stock-based compensation	268	291
Federal net operating loss carryover	14,078	40,800
State net operating loss carryover	1,353	1,147
Basis in partnerships	13,377	22,922
Warranty accrual	483	444
Inventory (Section 263A)	944	945
Accrued job costs	178	503
Reserve to complete	91	345
Alternative minimum tax credit carryover	1,145	158
Other	28	126
Deferred tax assets, gross	32,611	68,902
Valuation allowance	(1,346)	(1,147)	$ (1,161)
Deferred tax assets, net	31,265	67,755
Deferred tax liabilities:
Prepaid insurance	(17)	(43)
Other	(37)	(114)
Deferred tax liabilities	$ (54)	$ (157)