Since the Teton shares do not trade on one of the large stock markets, Cascade argues that the fair value of this investment is not readily available. According to the authoritative literature, when is the fair value of a security "readily determinable"? How is an impairment of a security accounted for? To avoid volatility in their financial statements due to fair value adjustments, Cascade debated whether the bond investment could be classified as held-to-maturity; Cascade is pretty sure it will hold the bonds for 5 years. How close to maturity could Cascade sell an investment and still classify it as held-to-maturity? What disclosures must be made for any sale or transfer from securities classified as held-to-maturity?