CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands	Jul. 31, 2011	Apr. 30, 2011
Current assets:
Cash and cash equivalents	$ 4,225	$ 3,881
Certificates of deposit	250	499
Accounts receivable, net of allowance for doubtful accounts of $75	75	203
Costs and estimated earnings in excess of billings on uncompleted contracts	0	32
Deferred cost of revenue	75	113
Inventories, net	907	436
Other current assets	233	132
Total current assets	5,765	5,296
Equipment, furniture and fixtures, net	424	432
Other noncurrent assets	65	65
Total assets	6,254	5,793
Current liabilities:
Accounts payable	553	152
Billings in excess of costs and estimated earnings on uncompleted contracts	146	231
Accrued payroll and related taxes	381	326
Warranty reserves	24	31
Payable to Parent	252	251
Other current liabilities	58	67
Deferred revenues	1,477	615
Total current liabilities	2,891	1,673
Long-term liabilities	7	12
Total liabilities	2,898	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	(53,014)	(52,262)
Total shareholders' equity	3,356	4,108
Total liabilities and shareholders' equity	$ 6,254	$ 5,793