Goodwill Schedule of changes in goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,745,000	$ 3,491,000
Impairment of Telerhythmics	0	(476,000)
Goodwill, ending balance	9,978,000	1,745,000
DMS Health
Goodwill [Roll Forward]
Derecognition		(1,098,000)
Telerhythmics
Goodwill [Roll Forward]
Derecognition		(172,000)
Impairment of Telerhythmics		(476,000)
ATRM Holdings, Inc.
Goodwill [Roll Forward]
Recognition of ATRM	8,233,000
Goodwill, ending balance	8,233,000
Goodwill, subsequent recognition	3,000
Diagnostic Services
Goodwill [Roll Forward]
Goodwill, beginning balance	1,745,000	2,393,000
Goodwill, ending balance	1,745,000	1,745,000
Diagnostic Services | DMS Health
Goodwill [Roll Forward]
Derecognition		0
Diagnostic Services | Telerhythmics
Goodwill [Roll Forward]
Derecognition		(172,000)
Impairment of Telerhythmics		(476,000)
Diagnostic Services | ATRM Holdings, Inc.
Goodwill [Roll Forward]
Recognition of ATRM	0
Medical Device Sales and Service
Goodwill [Roll Forward]
Goodwill, beginning balance	0	1,098,000
Impairment of Telerhythmics	(1,100,000)
Goodwill, ending balance	0	0
Medical Device Sales and Service | DMS Health
Goodwill [Roll Forward]
Derecognition		(1,098,000)
Medical Device Sales and Service | Telerhythmics
Goodwill [Roll Forward]
Derecognition		0
Impairment of Telerhythmics		0
Medical Device Sales and Service | ATRM Holdings, Inc.
Goodwill [Roll Forward]
Recognition of ATRM	0
Building and construction
Goodwill [Roll Forward]
Goodwill, beginning balance	0	0
Goodwill, ending balance	8,233,000	0
Building and construction | DMS Health
Goodwill [Roll Forward]
Derecognition		0
Building and construction | Telerhythmics
Goodwill [Roll Forward]
Derecognition		0
Impairment of Telerhythmics		$ 0
Building and construction | ATRM Holdings, Inc.
Goodwill [Roll Forward]
Recognition of ATRM	$ 8,233,000