Subsequent Event

12 Months Ended

Apr. 30, 2013

Subsequent Event

Subsequent Event

15.   Subsequent Event

        Subsequent to April 30, 2013, the Company's investment in two convertible bonds classified as available-for-sale issued by CybAero experienced a decline in fair value. As of June 18, 2013, the most practical date prior to the issuance of this Annual Report on Form 10-K, the closing stock price was 20.50 SEK. Based on the closing stock price on June 18, 2013, the fair value of the two convertible bonds held by the Company is $6,351,000 as compared to a fair value of $9,071,000 at April 30, 2013.