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Summary of Significant Accounting Policies (Schedule of Short-Term Investments) (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | $ 1,096,234 | $ 5,198,878
Gross unrealized gains | 62 | 810,116
Gross unrealized losses | (2,787) | (6,572)
Estimated fair value | 1,093,509 | 6,002,422
Certificates of deposit [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 925,000 | 1,099,775
Gross unrealized gains | $ 62 | $ 1,168
Gross unrealized losses |  |
Estimated fair value | $ 925,062 | $ 1,100,943
Municipal bonds [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | $ 171,234 | $ 536,046
Gross unrealized gains |  |
Gross unrealized losses | $ (2,787) | $ (6,572)
Estimated fair value | $ 168,447 | 529,474
Corporate fixed income bonds [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost |  | 3,563,057
Gross unrealized gains |  | $ 808,948
Gross unrealized losses |  |
Estimated fair value |  | $ 4,372,005

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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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