Business Segments - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Segment Reporting Information
Assets	$ 413,192	$ 342,595
Operating Segments | Rail, Technologies, and Services
Segment Reporting Information
Assets	165,651	171,608
Operating Segments | Precast Concrete Products
Segment Reporting Information
Assets	116,519	48,740
Operating Segments | Steel Products and Measurement
Segment Reporting Information
Assets	64,830	58,377
Unallocated corporate assets
Segment Reporting Information
Assets	$ 66,192	$ 63,870