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Impact of recent accounting standards (Details Textual) | 12 Months Ended
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Dec. 31, 2018
Accounting Standards Update 2016-15 [Member] |
New Accounting Pronouncement or Change in Accounting Principle, Description of Prior-period Information Retrospectively Adjusted | the adoption resulted in a reclassification of approximately $1.5 million in cash inflows related to the distribution of earnings from OC-BVI from investing activities to operating activities

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- Definition Description of the prior-period information that has been retrospectively adjusted when a new accounting pronouncement or a change in accounting principle is adopted. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794 + Details
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