Commitments and Contingent Liabilities Standby letters of credit may be issued to third-party suppliers and insurance institutions and can only be drawn upon in the event of the Companys failure to pay its obligations to a beneficiary. As of December 31, 2018 , we had a maximum financial exposure from unused standby letters of credit totaling $0.4 million . We dont expect circumstances to arise that would require us to perform under any of these arrangements and believe that the resolution of any claims that might arise in the future, either individually or in the aggregate, would not materially affect our condensed consolidated financial statements. Accordingly, no liability has been recorded as of December 31, 2018 with respect to the standby letters of credit. The Company also may enter into commercial letters of credit to facilitate payments to vendors and from customers. The Companys China operation, in limited circumstances, receives bankers acceptance drafts from customers as settlement for their trade accounts receivable. We in turn may transfer the acceptance drafts to a supplier of ours in settlement of current accounts payable. These drafts contain certain recourse provisions afforded to the transferee under laws of The Peoples Republic of China. If a transferee were to exercise its available recourse rights, the draft would revert back to our China operation and we would be required to satisfy the obligation with the transferee. At December 31, 2018 , the drafts transferred and outstanding totaled $0.6 million . No transferee has exercised their recourse rights against us. For additional information on bankers acceptance drafts, see Note 1  Business Description and Summary of Significant Accounting Policies of Notes to Condensed Consolidated Financial Statements. The Company provides only assurance-type warranties for a limited time period, which cover workmanship and assures the product complies with specifications provided by or agreed upon with the customer. We maintain a provision for limited warranty repair or replacement of products manufactured and sold, which has been established in specific manufacturing contract agreements. We estimate product warranty liability at the time of sale based on historical repair or replacement cost trends in conjunction with the length of the warranty offered. Management refines the warranty liability periodically based on changes in historical cost trends and in certain cases where specific warranty issues become known. Changes in the product warranty accrual for the six months ended December 31, 2018 and 2017 were as follows: Six Months Ended December 31 (Amounts in Thousands) 2018 2017 Product warranty liability at the beginning of the period $ 656 $ 593 Additions to warranty accrual (including changes in estimates) 66 186 Settlements made (in cash or in kind) (39 ) (79 ) Product warranty liability at the end of the period $ 683 $ 700