Revenue Recognition (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Total net sales	$ 17,669,000	$ 21,954,000
Products and Services Transferred Over Time
Total net sales	10,702,000	15,172,000
Products and Services Transferred at a Point in Time
Total net sales	6,967,000	6,782,000
Services
Total net sales	17,091,000	20,229,000
Services | Products and Services Transferred Over Time
Total net sales	10,702,000	15,172,000
Services | Products and Services Transferred at a Point in Time
Total net sales	6,389,000	5,057,000
Products
Total net sales	578,000	1,725,000
Products | Products and Services Transferred Over Time
Total net sales	0	0
Products | Products and Services Transferred at a Point in Time
Total net sales	$ 578,000	$ 1,725,000