Summary of Significant Accounting Policies (Details)				12 Months Ended
	Nov. 17, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 30, 2023 USD ($)	Dec. 31, 2024 USD ($) segment facility	Dec. 31, 2023 USD ($)
Property, Plant and Equipment
Number of reportable segments | segment				2
Number of operating segments | segment				2
Cash and cash equivalents				$ 2,454,000	$ 2,560,000
Impairments of property, plant, and equipment				0	0
Product warranty reserve				602,000	688,000
Foreign currency transaction gain (loss)				154,000	(77,000)
Research and development expenses				2,831,000	2,555,000
Gain on sale of former joint venture facility				$ 3,477,000	0
Cougar Mountain Precast, LLC
Property, Plant and Equipment
Consideration transferred to acquire operating assets	$ 1,644,000
Buildings | Minimum
Property, Plant and Equipment
Property, plant and equipment useful life				10 years
Buildings | Maximum
Property, Plant and Equipment
Property, plant and equipment useful life				40 years
Machinery and equipment | Minimum
Property, Plant and Equipment
Property, plant and equipment useful life				2 years
Machinery and equipment | Maximum
Property, Plant and Equipment
Property, plant and equipment useful life				50 years
Leasehold improvements | Minimum
Property, Plant and Equipment
Property, plant and equipment useful life				3 years
Leasehold improvements | Maximum
Property, Plant and Equipment
Property, plant and equipment useful life				19 years
Non Domestic
Property, Plant and Equipment
Cash and cash equivalents				$ 1,882,000	$ 2,193,000
Rail Products Business Unit
Property, Plant and Equipment
Proceeds from divestiture of assets		$ 2,362,000
Coatings and Measurement
Property, Plant and Equipment
Proceeds from divestiture of assets			$ 5,344,000
Infrastructure Solutions
Property, Plant and Equipment
Number of manufacturing facilities | facility				9