of $87.9 million. Reductions in the balances of accounts receivable and contract assets, primarily at the TRC and APC operations, provided cash in the amounts of $6.6 million and $6.2 million, respectively. In addition, the combined level of accounts payable and accrued expenses increased by $28.9 million during the nine months ended October 31, 2020, a source of cash for the period.
As discussed above, our income tax accounting for the nine months ended October 31, 2020 reflects an entry to record the carryback of our net operating loss incurred for the year ended January 31, 2020 to our tax year ended January 31, 2015. The loss carryback should result in a refund of federal income taxes in the amount of $12.7 million. This tax refund receivable has been included in the balance of other current assets as of October 31, 2020, which was the primary cause of the increase in this balance of $14.5 million during the period, a use of cash.
Primary sources of cash for the nine months ended October 31, 2020 were the net maturities of short-term investments, certificates of deposit issued by the Bank, in the amount of $70.0 million. Non-operating activities used cash during the nine months ended October 31, 2020, including the payment of regular and special cash dividends in the total amount of $27.4 million. During the nine-month period ended October 31, 2020, capital expenditures were reduced by approximately 77.6% to $1.4 million from a capital expenditures amount of $6.3 million for the nine months ended October 31, 2019. Partially offsetting these uses of cash, we received cash proceeds related to the exercise of stock options during the nine months ended October 31, 2020 in the amount of $1.2 million. As of October 31, 2020, there were no restrictions with respect to inter-company payments between GPS, TRC, APC, SMC and the holding company. However, during the prior year, certain loans made by Argan to APC were determined to be uncollectible.
Last year, the net amount of cash provided by operating activities for the nine months ended October 31, 2019 was $15.9 million. Our net loss for the period, offset partially by the favorable adjustments related to non-cash income and expense items, used cash in the total amount of $29.3 million. The Company also used cash during the nine months ended October 31, 2019 in the amount of $12.5 million to reduce the level of accounts payable and accrued expenses. However, these uses of cash were more than offset by the receipt of payments on the initial billings for EPC project work, which caused the balance of contract liabilities to increase temporarily by $50.1 million during the nine months ended October 31, 2019, a substantial source of cash.
Cash required to fund operations during the nine months ended October 31, 2019 was provided primarily by the net maturities of short-term investments, certificates of deposit issued by our Bank, in the amount of $89.0 million. Cash proceeds in the amount of $1.6 million were received from the exercise of stock options during the nine-month period ended October 31, 2019. Non-operating activities used cash during the nine months ended October 31, 2019, including the payment of three quarterly cash dividends in the total amount of $11.7 million and capital expenditures in the amount of $6.3 million.
At October 31, 2020, most of our balance of cash and cash equivalents was invested in money market funds with most of their total assets invested in cash, US Treasury obligations and repurchase agreements secured by US Treasury obligations. The major portion our domestic operating bank account balances are maintained with the Bank. We do maintain certain Euro-based bank accounts in Ireland and certain pound sterling-based bank accounts in the UK in support of the operations of APC.
Our Credit Agreement, which expires on May 31, 2021, includes the following features, among others: a lending commitment of $50.0 million including a revolving loan with interest at the 30-day LIBOR plus 2.0%, and an accordion feature which allows for an additional commitment amount of $10.0 million, subject to certain conditions. We may use the borrowing ability to cover other credit instruments issued by the Bank for our use in the ordinary course of business as defined by the Bank. At October 31, 2020, we had $1.7 million of outstanding letters of credit issued under the Credit Agreement. However, we had no outstanding borrowings. Additionally, in connection with the current project development activities by a VIE, the Bank issued a letter of credit, outside the scope of the Credit Agreement, in the approximate amount of $3.4 million for which the Company has provided cash collateral.
We have pledged the majority of our assets to secure the financing arrangements. The Bank’s consent is not required for acquisitions, divestitures, cash dividends or significant investments as long as certain conditions are met. The Credit Agreement requires that we comply with certain financial covenants at our fiscal year-end and at each fiscal quarter-end, and includes other terms, covenants and events of default that are customary for a credit facility of its size and nature. At