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Fair value measurements (Details 1) - USD ($)		3 Months Ended				6 Months Ended
		Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Jun. 30, 2015
Investment in OC-BVI
Impairment of investment in OC-BVI (See Note 7)		$ 0	$ 50,000	$ 275,000	$ 310,000	$ 50,000	$ 585,000
Net liability arising from put/call options
Balance as of June 30, 2016		383,000				383,000
Fair Value, Inputs, Level 3 [Member]
Investment in OC-BVI
Balance as of December 31, 2015			4,548,271			4,548,271
Profit sharing and equity from earnings of OC-BVI						179,822
Distributions received from OC-BVI						0
Impairment of investment in OC-BVI (See Note 7)						(50,000)
Balance as of June 30, 2016		4,678,093				4,678,093
Net liability arising from put/call options
Balance as of December 31, 2015	[1]		$ 0			0
Net liability arising from put/call options	[1]					383,000
Balance as of June 30, 2016	[1]	$ 383,000				$ 383,000
[1] The net liability arising from put/call options is included in the accompanying condensed consolidated balance sheets within other liabilities as of June 30, 2016.

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- Definition

This items represents the entity's equity in earnings and profit sharing rights earned for the period from its unconsolidated equity method investee.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(10))
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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 323
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Fair value portion of investments accounted under the equity method.

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Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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