Interim Financial Reporting Interim Financial Reporting - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Total Revenue	$ 9,833,000	$ 10,728,000	$ 18,958,000	$ 20,225,000
Change	$ (895,000)		$ (1,267,000)
% of Change	(8.00%)		(6.00%)
Soundwall Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 2,525,000	1,429,000	$ 5,005,000	2,656,000
Change	$ 1,096,000		$ 2,349,000
% of Change	77.00%		88.00%
Architectural Panel Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 245,000	0	$ 457,000	18,000
Change	$ 245,000		$ 439,000
% of Change	100.00%		2439.00%
SlenderWall Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 1,422,000	0	$ 2,565,000	0
Change	$ 1,422,000		$ 2,565,000
% of Change	100.00%		100.00%
Miscellaneous Wall Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 267,000	709,000	$ 759,000	1,372,000
Change	$ (442,000)		$ (613,000)
% of Change	(62.00%)		(45.00%)
Barrier Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 1,590,000	3,912,000	$ 3,875,000	6,069,000
Change	$ (2,322,000)		$ (2,194,000)
% of Change	(59.00%)		(36.00%)
Easi-Set and Easi-Span Building Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 560,000	1,061,000	$ 1,062,000	1,397,000
Change	$ (501,000)		$ (335,000)
% of Change	(47.00%)		(24.00%)
Utility and Farm Product Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 246,000	350,000	$ 460,000	808,000
Change	$ (104,000)		$ (348,000)
% of Change	(30.00%)		(43.00%)
Miscellaneous Product Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 88,000	150,000	$ 213,000	239,000
Change	$ (62,000)		$ (26,000)
% of Change	(41.00%)		(11.00%)
Total Product Sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 6,943,000	7,611,000	$ 14,396,000	12,559,000
Change	$ (668,000)		$ 1,837,000
% of Change	(9.00%)		15.00%
Barrier Rentals
Disaggregation of Revenue [Line Items]
Total Revenue	$ 340,000	302,000	$ 649,000	2,825,000
Change	$ 38,000		$ (2,176,000)
% of Change	13.00%		(77.00%)
Royalty Income
Disaggregation of Revenue [Line Items]
Total Revenue	$ 506,000	473,000	$ 727,000	904,000
Change	$ 33,000		$ (177,000)
% of Change	7.00%		(20.00%)
Shipping and Installation Revenue
Disaggregation of Revenue [Line Items]
Total Revenue	$ 2,044,000	2,342,000	$ 3,186,000	3,937,000
Change	$ (298,000)		$ (751,000)
% of Change	(13.00%)		(19.00%)
Total Service Revenue
Disaggregation of Revenue [Line Items]
Total Revenue	$ 2,890,000	$ 3,117,000	$ 4,562,000	$ 7,666,000
Change	$ (227,000)		$ (3,104,000)
% of Change	(7.00%)		(40.00%)