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Stock appreciation rights (SARs) (Details 2) - Stock Appreciation Rights (SARs) [Member]	Mar. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2019	$ 1,496,171
2020	1,262,129
2021	373,333
2022	62,222
Total	$ 3,193,855

X

- Definition

Unrecognized cost of unvested share-based compensation awards yet to be recognized in year four.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards yet to be recognized in current year.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards yet to be recognized in year three.

+ References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards yet to be recognized in current year.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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