Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments			2
Revenue	$ 3,788	$ 3,387	$ 6,767	$ 6,546
Gross profit	2,961	2,776	5,234	5,312
Amortization of intangible assets	195	188	382	362
Intangible assets	2,957	3,535	2,957	3,535
Intersection [Member]
Segment Reporting Information [Line Items]
Revenue	2,637	2,465	4,529	4,715
Gross profit	2,437	2,233	4,161	4,302
Amortization of intangible assets	97	91	190	183
Intangible assets	1,364	1,559	1,364	1,559
Highway [Member]
Segment Reporting Information [Line Items]
Revenue	1,151	922	2,238	1,831
Gross profit	524	543	1,073	1,010
Amortization of intangible assets	98	97	192	179
Intangible assets	$ 1,593	$ 1,976	$ 1,593	$ 1,976