For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Summary of Significant Accounting Policies (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) Customer / Customers	Jun. 30, 2018 USD ($) Customer / Customers	Jun. 30, 2019 USD ($) Customer / Customers	Jun. 30, 2018 USD ($) Customer / Customers	Dec. 31, 2018 USD ($)
Summary of Significant Accounting Policies (Textual)
Stock-based compensation	$ 93,000	$ 142,000	$ 326,000	$ 225,000
Goodwill	163,000		163,000		$ 163,000
NTW [Member]
Summary of Significant Accounting Policies (Textual)
Goodwill	$ 163,000		$ 163,000		$ 163,000
Sales [Member]
Summary of Significant Accounting Policies (Textual)
Number of customers \| Customer / Customers	3	3	3	3
Concentration risks	75.60%	74.50%	74.70%	73.80%
Receivables [Member]
Summary of Significant Accounting Policies (Textual)
Number of customers \| Customer / Customers			2	2
Concentration risks			58.90%	64.50%