XML 30 R16.htm IDEA: XBRL DOCUMENT
v3.19.1

U. S. GOVERNMENT SECURITIES (Tables) | 12 Months Ended
--- | ---
Jan. 31, 2019
U. S. GOVERNMENT SECURITIES |
Schedule of U.S. government securities classified as held-to-maturity |
|  | 2019 |  | 2018 |
|  | Carrying |  |  |  |  | Carrying |  |  |  |
|  | Value |  | Fair Value |  | Value |  | Fair Value |
Due within one year |  | $ | 32,122,312 |  | $ | 32,138,647 |  | $ | 23,797,451 |  | $ | 23,800,904 |
Due after one year |  |  | — |  |  | — |  |  | — |  |  | — |
|  | $ | 32,122,312 |  | $ | 32,138,647 |  | $ | 23,797,451 |  | $ | 23,800,904 |

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration