Revenue recognition. We recognize revenues when all of the following have been satisfied: · persuasive evidence of an arrangement exists; · the price to the customer is fixed and determinable; · delivery has occurred and any acceptance terms have been fulfilled; and · collection is reasonably assured. Revenues are reported net of incentive rebates and discounts. Amounts billed prior to completing the earnings process are deferred until revenue recognition criteria are met. Our standard sales contracts do not contain right of return provisions and we have not experienced significant sales returns. Therefore we have not recorded an allowance for sales returns. Product lease and royalty revenue   Lease and royalty revenue is earned from the leasing of our tangible products and the licensing of our intangible products, such as our proprietary table games. When we lease or license our products, we generally negotiate month-to-month fixed fee contracts, or to a lesser extent, enter into participation arrangements whereby casinos pay a fee to us based on a percentage of net win. Lease and royalty revenue commences upon the completed installation of the product. Lease terms are generally cancellable with 30 days  notice. We recognize revenue from our leases and licenses upon installation of our product on a month-to-month basis. Product sales and service revenue   We generate sales revenue through the sale of equipment in each product segment, including sales revenue from sales-type leases and the sale of lifetime licenses for our proprietary table games. Our credit sales terms are primarily 30 to 90 days. Financing for intangible property and sales-type leases for tangible property have payment terms ranging generally from 24 to 36 months and are usually interest-bearing at market interest rates. Revenue from the sale of equipment is recorded in accordance with the contractual shipping terms. Products placed with customers on a trial basis are not recognized as revenue until the trial period ends, the customer accepts t