Summary of Significant Accounting Policies (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Total revenues	$ 40,220	$ 41,717
Change	$ (1,497)
Percent of change	(36.00%)
Product sales
Total revenues	$ 29,159	29,055
Change	$ 104
Percent of change	0.40%
Product sales | Soundwall sales
Total revenues	$ 9,867	7,571
Change	$ 2,296
Percent of change	30.30%
Product sales | Architectural sales
Total revenues	$ 876	829
Change	$ 47
Percent of change	5.70%
Product sales | Slenderwall sales
Total revenues	$ 5,572	2,048
Change	$ 3,524
Percent of change	172.10%
Product sales | Miscellaneous sales
Total revenues	$ 1,760	2,793
Change	$ (1,033)
Percent of change	(37.00%)
Product sales | Barrier sales
Total revenues	$ 7,264	11,276
Change	$ (4,012)
Percent of change	(35.60%)
Product sales | Easi-Set and Easi-Span Building sales
Total revenues	$ 2,114	2,484
Change	$ (370)
Percent of change	(14.90%)
Product sales | Utility and farm product sales
Total revenues	$ 1,232	1,492
Change	$ (260)
Percent of change	(17.40%)
Product sales | Miscellaneous product sales
Total revenues	$ 474	562
Change	$ (88)
Percent of change	(15.70%)
Service revenue
Total revenues	$ 11,061	12,662
Change	$ (1,601)
Percent of change	(12.60%)
Service revenue | Barrier rentals
Total revenues	$ 1,729	4,267
Change	$ (2,538)
Percent of change	(59.50%)
Service revenue | Royalties
Total revenues	$ 1,675	1,885
Change	$ (210)
Percent of change	(11.10%)
Service revenue | Shipping and installation
Total revenues	$ 7,657	$ 6,510
Change	$ 1,147
Percent of change	17.60%