CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011	Apr. 30, 2011
Current assets:
Cash and cash equivalents	$ 2,536	$ 3,881
Certificates of deposit	500	499
Accounts receivable, net of allowance for doubtful accounts of $75	1,024	203
Costs and estimated earnings in excess of billings on uncompleted contracts	0	32
Deferred cost of revenue	376	113
Inventories	1,722	436
Other current assets	317	132
Total current assets	6,475	5,296
Equipment, furniture and fixtures, net	430	432
Other noncurrent assets	65	65
Total assets	6,970	5,793
Current liabilities:
Accounts payable	964	152
Billings in excess of costs and estimated earnings on uncompleted contracts	89	231
Accrued payroll and related taxes	369	326
Warranty reserves	26	31
Payable to Parent	252	251
Other current liabilities	60	67
Deferred revenues	1,995	615
Total current liabilities	3,755	1,673
Long-term liabilities	2	12
Total liabilities	3,757	1,685
Commitments and contingencies
Shareholders' equity:
Preferred shares, no par value; 20,000 shares authorized; no shares issued or outstanding	0	0
Common shares, no par value; 50,000 shares authorized; 12,963 shares issued and outstanding	56,370	56,370
Accumulated deficit	(53,157)	(52,262)
Total shareholders' equity	3,213	4,108
Total liabilities and shareholders' equity	$ 6,970	$ 5,793