Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Property and equipment estimated useful lives

	Years
Buildings		10-40
Trucks and automotive equipment		3-10
Shop machinery and equipment		3-10
Land improvements		10-15
Rental equipment		5-10
Office equipment		3-10

Disaggregation of revenue

Revenue by Type
	2018		2017		Change			% of Change
Product Sales:
Soundwall Sales	$	9,867	$	7,571	$	2,296			30.3	%
Architectural Sales		876		829		47			5.7	%
Slenderwall Sales		5,572		2,048		3,524			172.1	%
Miscellaneous Sales		1,760		2,793		(1,033	)		(37.0	)%
Barrier Sales		7,264		11,276		(4,012	)		(35.6	)%
Easi-Set and Easi-Span Building Sales		2,114		2,484		(370	)		(14.9	)%
Utility and Farm Product Sales		1,232		1,492		(260	)		(17.4	)%
Miscellaneous Product Sales		474		562		(88	)		(15.7	)%
Total Product Sales		29,159		29,055		104			0.4	%
Barrier Rentals		1,729		4,267		(2,538	)		(59.5	)%
Royalty Income		1,675		1,885		(210	)		(11.1	)%
Shipping and Installation		7,657		6,510		1,147			17.6	%
Total Service Revenue		11,061		12,662		(1,601	)		(12.6	)%
Total Revenue	$	40,220	$	41,717	$	(1,497	)		(3.6	)%