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Fair value measurements (Details) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Recurring |  |
Marketable securities | $ 8,575,899 | $ 8,570,338
Nonrecurring |  |
Investment in affiliate | 6,854,775 | 6,925,346
Fair Value, Inputs, Level 1 [Member] |  |
Recurring |  |
Marketable securities | 8,575,899 | 8,570,338
Nonrecurring |  |
Investment in affiliate | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Recurring |  |
Marketable securities | 0 | 0
Nonrecurring |  |
Investment in affiliate | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Recurring |  |
Marketable securities | 0 | 0
Nonrecurring |  |
Investment in affiliate | $ 6,854,775 | $ 6,925,346

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- Definition Fair value portion of investments in an entity not consolidated. Includes, but is not limited to, investments in an entity that is affiliated with the reporting entity by means of direct or indirect ownership, an entity in which the reporting entity shares control of the entity with another party or group, an entity which the company has significant influence, but does not have control and subsidiaries that are not required to be consolidated and are accounted for using the equity or cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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