11 ) SEGMENT INFORMATION FutureFuel has two reportable segments organized along similar product groups  chemicals and biofuels. Chemicals FutureFuels chemicals segment manufactures diversified chemical products that are sold externally to third party customers. This segment is comprised of two components: custom manufacturing (manufacturing chemicals for specific customers) and performance chemicals (multi-customer specialty chemicals). Biofuels FutureFuels biofuels segment primarily manufactures and markets biodiesel. Biodiesel revenues are generated through the sale of biodiesel to customers through FutureFuels distribution network at the Batesville Plant, through distribution facilities available at leased oil storage facilities, and through a network of remotely located tanks. Biofuels revenues also include the sale of biodiesel blends with petrodiesel, petrodiesel with no biodiesel added, internally generated, separated Renewable Identification Numbers (RINs), biodiesel production byproducts, and the purchase and sale of other petroleum products on common carrier pipelines. Biodiesel selling prices and profitability can at times fluctuate based on the timing of unsold, internally generated RINs. FutureFuel does not allocate production costs to internally generated RINs, and, from time to time, can enter into sales of biodiesel on a RINs-free basis. Such method of selling results in FutureFuel maintaining possession of the applicable RINs from the sale. The benefit derived from the eventual sale of the RINs is not reflected in results of operations until such time as the RIN sale has been completed, which may lead to variability in reported operating results. Summary of long-lived assets and revenues by geographic area All of FutureFuels long-lived assets are located in the United States. Most of FutureFuels sales are transacted with control and title passing at the time of shipment from the Batesville Plant, although some sales are transacted with control and title passing at the delivery point. While many of FutureFuels chemicals are utilized to manufacture products that are shipped, further processed, and/or consumed throughout the world, the chemical products, with limited exceptions, generally leave the United States only after ownership has transferred from FutureFuel to the customer. FutureFuel is rarely the exporter of record, never the importer of record into foreign countries, and is not always aware of the exact quantities of its products that are moved into foreign markets by its customers. FutureFuel does track the addresses of its customers for invoicing purposes and uses this address to determine whether a particular sale is within or outside the United States. FutureFuels revenues attributable to the United States and foreign countries (based upon the billing addresses of its customers) were as follows: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 United States $ 70,302 $ 87,525 $ 118,266 $ 142,791 All Foreign Countries 562 811 1,099 1,292 Total $ 70,864 $ 88,336 $ 119,365 $ 144,083 Revenues from a single foreign country during the three and six months ended June 30, 2019 and 2018 did not exceed 1% of total revenues. Summary of business by segment Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Revenue Custom chemicals $ 21,965 $ 27,072 $ 45,665 $ 50,492 Performance chemicals 3,894 4,455 7,546 10,116 Chemicals revenue 25,859 31,527 53,211 60,608 Biofuels revenue 45,005 56,809 66,154 83,475 Total Revenue $ 70,864 $ 88,336 $ 119,365 $ 144,083 Segment gross profit/(loss) Chemicals $ 7,181 $ 8,016 $ 14,490 $ 15,572 Biofuels (3,911 ) 255 (7,958 ) 30,206 Total gross profit 3,270 8,271 6,532 45,778 Corporate expenses (2,085 ) (2,431 ) (4,136 ) (5,371 ) Income before interest and taxes 1,185 5,840 2,396 40,407 Interest and other income 3,576 2,434 8,865 4,145 Interest and other expense (157 ) (220 ) (200 ) (4,351 ) (Provision)/benefit for income taxes (917 ) (2,003 ) (1,875 ) 1,676 Net income $ 3,687 $ 6,051 $ 9,186 $ 41,877 Depreciation is allocated to segment costs of goods sold based on plant usage. The total assets and capital expenditures of FutureFuel have not been allocated to individual segments as large portions of these assets are shared to varying degrees by each segment, causing such an allocation to be of little value.