Marketable Securities (Narrative) (Details) |
Sep. 30, 2016
USD ($)
item
|
Dec. 31, 2015
USD ($)
|
|---|---|---|
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair value | $ 13,419,359 | $ 13,240,086 |
| Unrealized losses | $ 6,041 | $ 18,612 |
| 5 Commercial Paper With Unrealized Losses [Member] | ||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Securities in a loss position, less than one year | item | 5 | |
| Fair value | $ 4,975,230 | |
| Unrealized losses | $ 1,152 | |
| 4 Corporate Bond Securities With Unrealized Losses Less Than 12 Months [Member] | ||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Securities in a loss position, less than one year | item | 4 | |
| Fair value | $ 4,044,320 | |
| Unrealized losses | $ 4,889 |
| X | ||||||||||
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for less than one year or normal operating cycle, if longer, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. No definition available.
|
| X | ||||||||||
- 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. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|