INTERIM FINANCIAL REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Total revenues	$ 10,189	$ 9,125
Change	$ 1,064
Percent of change	12.00%
Product sales
Total revenues	$ 7,503	7,453
Change	$ 50
Percent of change	1.00%
Product sales | Soundwall sales
Total revenues	$ 2,114	2,480
Change	$ (366)
Percent of change	(15.00%)
Product sales | Architectural panel sales
Total revenues	$ 0	213
Change	$ (213)
Percent of change	(100.00%)
Product sales | SlenderWall sales
Total revenues	$ 1,963	1,143
Change	$ 820
Percent of change	72.00%
Product sales | Miscellaneous wall sales
Total revenues	$ 363	493
Change	$ (130)
Percent of change	(26.00%)
Product sales | Barrier sales
Total revenues	$ 1,591	2,285
Change	$ (694)
Percent of change	(30.00%)
Product sales | Easi-Set and Easi-Span building sales
Total revenues	$ 1,034	502
Change	$ 532
Percent of change	106.00%
Product sales | Utility and farm product sales
Total revenues	$ 308	214
Change	$ 94
Percent of change	44.00%
Product sales | Miscellaneous sales
Total revenues	$ 130	123
Change	$ 7
Percent of change	6.00%
Service revenue
Total revenues	$ 2,686	1,672
Change	$ 1,014
Percent of change	61.00%
Service revenue | Barrier rentals
Total revenues	$ 573	309
Change	$ 264
Percent of change	85.00%
Service revenue | Royalty income
Total revenues	$ 306	221
Change	$ 85
Percent of change	38.00%
Service revenue | Shipping and installation revenue
Total revenues	$ 1,807	$ 1,142
Change	$ 665
Percent of change	58.00%