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Financial Instruments and Credit Risk Concentrations
3 Months Ended
Oct. 31, 2020
Fair Value Disclosures [Abstract]  
Financial Instruments and Credit Risk Concentrations
4. Financial Instruments and Credit Risk Concentrations:
          
Financial instruments that are potentially subject to concentrations of credit risk consist principally of marketable securities, restricted cash, cash and cash equivalents, and receivables. Marketable securities, restricted cash, cash, and cash equivalents are placed with multiple financial institutions and instruments to minimize risk. No assurance can be made that such financial institutions and instruments will minimize all such risk.
 

As of October 31, 2020, six tenants accounted for approximately 60% of receivables. As of July 31, 2020, four tenants accounted for approximately 55% of receivables. During the three months ended October 31, 2020, two tenants accounted for 30% of total rental revenue. During the three months ended October 31, 2019, three tenants accounted for 44% of total rental revenue.