CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2013	Apr. 30, 2013
Current assets:
Accounts receivable, allowance for doubtful accounts	$ 75	$ 75	[1]
Shareholders' equity:
Preferred shares, par value (in dollars per share)	$ 0	$ 0	[1]
Preferred shares, shares authorized (in shares)	20,000	20,000	[1]
Preferred shares, shares issued (in shares)	0	0	[1]
Preferred shares, shares outstanding (in shares)	0	0	[1]
Common shares, par value (in dollars per share)	$ 0	$ 0	[1]
Common shares, shares authorized (in shares)	50,000	50,000	[1]
Common shares, shares issued (in shares)	12,963	12,963	[1]
Common shares, shares outstanding (in shares)	12,963	12,963	[1]

[1] Derived from the consolidated audited financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended April 30, 2013 filed with the SEC.