Interim Financial Reporting Interim Financial Reporting - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Total Revenue	$ 9,544	$ 11,481	$ 28,502	$ 31,706
Change	$ (1,937)		$ (3,204)
% of Change	(17.00%)		(10.00%)
Soundwall Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 2,334	2,368	$ 7,339	5,024
Change	$ (34)		$ 2,315
% of Change	(1.00%)		46.00%
Architectural Panel Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 41	551	$ 498	569
Change	$ (510)		$ (71)
% of Change	(93.00%)		(12.00%)
SlenderWall Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 1,637	913	$ 4,203	912
Change	$ 724		$ 3,291
% of Change	79.00%		361.00%
Miscellaneous Wall Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 87	639	$ 846	2,012
Change	$ (552)		$ (1,166)
% of Change	(86.00%)		(58.00%)
Barrier Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 1,749	3,615	$ 5,624	9,684
Change	$ (1,866)		$ (4,060)
% of Change	(52.00%)		(42.00%)
Easi-Set and Easi-Span Building Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 496	730	$ 1,557	2,127
Change	$ (234)		$ (570)
% of Change	(32.00%)		(27.00%)
Utility and Farm Product Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 429	322	$ 890	1,129
Change	$ 107		$ (239)
% of Change	33.00%		(21.00%)
Miscellaneous Product Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 55	157	$ 267	396
Change	$ (102)		$ (129)
% of Change	(65.00%)		(33.00%)
Total Product Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 6,828	9,295	$ 21,224	21,853
Change	$ (2,467)		$ (629)
% of Change	(27.00%)		(3.00%)
Barrier Rentals
Disaggregation of Revenue [Line Items]
Total Revenue	$ 540	319	$ 1,188	3,145
Change	$ 221		$ (1,957)
% of Change	69.00%		(62.00%)
Royalty Income
Disaggregation of Revenue [Line Items]
Total Revenue	$ 465	483	$ 1,193	1,387
Change	$ (18)		$ (194)
% of Change	(4.00%)		(14.00%)
Shipping and Installation Revenue
Disaggregation of Revenue [Line Items]
Total Revenue	$ 1,711	1,384	$ 4,897	5,321
Change	$ 327		$ (424)
% of Change	24.00%		(8.00%)
Total Service Revenue
Disaggregation of Revenue [Line Items]
Total Revenue	$ 2,716	$ 2,186	$ 7,278	$ 9,853
Change	$ 530		$ (2,575)
% of Change	24.00%		(26.00%)