Fair Value Measurements - Schedule of Fair Value of Assets on Recurring Basis (Details) |
Apr. 30, 2018
USD ($)
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Cash equivalents | $ 4,800,000 |
Total | 23,656,948 |
Level 1 [Member] | |
Total | 23,655,409 |
Level 2 [Member] | |
Total | 1,539 |
Level 3 [Member] | |
Total | |
Money Market Fund [Member] | |
Cash equivalents | 539,796 |
Money Market Fund [Member] | Level 1 [Member] | |
Cash equivalents | 538,257 |
Money Market Fund [Member] | Level 2 [Member] | |
Cash equivalents | 1,539 |
Money Market Fund [Member] | Level 3 [Member] | |
Cash equivalents | |
US Treasury Securities [Member] | |
Cash equivalents | 4,244,236 |
Held-to-maturity investments | 18,872,916 |
US Treasury Securities [Member] | Level 1 [Member] | |
Cash equivalents | 4,244,236 |
Held-to-maturity investments | 18,872,916 |
US Treasury Securities [Member] | Level 2 [Member] | |
Cash equivalents | |
Held-to-maturity investments | |
US Treasury Securities [Member] | Level 3 [Member] | |
Cash equivalents | |
Held-to-maturity investments |
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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