INTERIM FINANCIAL REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Total revenues	$ 10,450	$ 10,852	$ 20,275	$ 21,041
Change	$ (402)		$ (766)
Percent of change	(4.00%)		(4.00%)
Product Sales
Total revenues	$ 6,699	7,327	$ 13,550	14,831
Change	$ (628)		$ (1,281)
Percent of change	(9.00%)		(9.00%)
Product Sales | Soundwall Sales
Total revenues	$ 2,200	1,939	$ 4,087	4,053
Change	$ 261		$ 34
Percent of change	13.00%		1.00%
Product Sales | Architectural Panel Sales
Total revenues	$ 766	424	$ 1,533	424
Change	$ 342		$ 1,109
Percent of change	81.00%		262.00%
Product Sales | SlenderWall Sales
Total revenues	$ 0	772	$ 923	2,735
Change	$ (772)		$ (1,812)
Percent of change	(100.00%)		(66.00%)
Product Sales | Miscellaneous Wall Sales
Total revenues	$ 1,128	406	$ 2,031	769
Change	$ 722		$ 1,262
Percent of change	178.00%		164.00%
Product Sales | Barrier Sales
Total revenues	$ 945	1,817	$ 2,270	3,408
Change	$ (872)		$ (1,138)
Percent of change	(48.00%)		(33.00%)
Product Sales | Easi-Set and Easi-Span Building Sales
Total revenues	$ 768	1,335	$ 1,328	2,369
Change	$ (567)		$ (1,041)
Percent of change	(42.00%)		(44.00%)
Product Sales | Utility Sales
Total revenues	$ 388	449	$ 789	757
Change	$ (61)		$ 32
Percent of change	(14.00%)		4.00%
Product Sales | Miscellaneous Sales
Total revenues	$ 504	185	$ 589	316
Change	$ 319		$ 273
Percent of change	172.00%		87.00%
Service Revenue
Total revenues	$ 3,751	3,525	$ 6,725	6,210
Change	$ 226		$ 515
Percent of change	6.00%		8.00%
Service Revenue | Barrier Rentals
Total revenues	$ 907	582	$ 1,650	1,163
Change	$ 325		$ 487
Percent of change	56.00%		42.00%
Service Revenue | Royalty Income
Total revenues	$ 413	429	$ 681	735
Change	$ (16)		$ (54)
Percent of change	(4.00%)		(7.00%)
Service Revenue | Shipping and Installation Revenue
Total revenues	$ 2,431	$ 2,514	$ 4,394	$ 4,312
Change	$ (83)		$ 82
Percent of change	(3.00%)		2.00%