Segment Information (Details Textual)	3 Months Ended	12 Months Ended
Mar. 31, 2019 USD ($) Segment	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)
Segment Information (Textual)
Number of reportable segments \| Segment	2	2
Goodwill	$ 6,736,043	$ 6,736,043	$ 6,736,043
South America [Member]
Segment Information (Textual)
Gross long lived assets	700,000	800,000
Goodwill	100,000	200,000
Africa [Member]
Segment Information (Textual)
Gross long lived assets	2,200,000	2,100,000
Goodwill	1,700,000	1,600,000
North America [Member]
Segment Information (Textual)
Gross long lived assets	7,300,000	7,400,000
Goodwill	$ 4,900,000	$ 4,900,000

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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