This excerpt taken from the GTI 10-K filed Mar 16, 2006.
Investments in marketable debt and equity securities are generally classified and accounted for as trading, held-to-maturity or available-for-sale securities. We determine the
appropriate classification of debt and equity securities at the time of purchase and reassess the classification at each reporting date. Debt securities classified as held-to-maturity are reported at amortized cost plus accrued interest. Securities classified as available-for-sale are reported at fair value with unrealized gains and losses, net of related tax, recorded as a separate component of comprehensive loss on the Consolidated Statement of Stockholders Deficit until realized. Interest and amortization of premiums and discounts for debt securities are included in interest expense. Gains and losses on securities sold are determined based on the specific identification method and are included in other (income) expense, net. Unrealized losses on investment securities that are other than temporary are recognized in net income (loss). We do not hold securities for speculative or trading purposes.