INTERIM FINANCIAL REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Total revenues	$ 9,825	$ 10,189
Change	$ (364)
Percent of change	(4.00%)
Product sales
Total revenues	$ 6,852	7,503
Change	$ (651)
Percent of change	(9.00%)
Product sales | Soundwall sales
Total revenues	$ 1,887	2,114
Change	$ (227)
Percent of change	(11.00%)
Product sales | Architectural panel sales
Total revenues	$ 767	0
Change	$ 767
Percent of change	100.00%
Product sales | SlenderWall sales
Total revenues	$ 923	1,963
Change	$ (1,040)
Percent of change	(53.00%)
Product sales | Miscellaneous wall sales
Total revenues	$ 903	363
Change	$ 540
Percent of change	149.00%
Product sales | Barrier sales
Total revenues	$ 1,325	1,591
Change	$ (266)
Percent of change	(17.00%)
Product sales | Easi-Set and Easi-Span building sales
Total revenues	$ 559	1,034
Change	$ (475)
Percent of change	(46.00%)
Product sales | Utility and farm product sales
Total revenues	$ 401	308
Change	$ 93
Percent of change	30.00%
Product sales | Miscellaneous sales
Total revenues	$ 87	130
Change	$ (43)
Percent of change	(34.00%)
Service revenue
Total revenues	$ 2,973	2,686
Change	$ 287
Percent of change	11.00%
Service revenue | Barrier rentals
Total revenues	$ 742	573
Change	$ 169
Percent of change	29.00%
Service revenue | Royalty income
Total revenues	$ 268	306
Change	$ (38)
Percent of change	(12.00%)
Service revenue | Shipping and installation revenue
Total revenues	$ 1,963	$ 1,807
Change	$ 156
Percent of change	9.00%