CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Apr. 30, 2012	Apr. 30, 2011
Current assets:
Cash and cash equivalents	$ 2,783	$ 3,881
Certificates of deposit	250	499
Accounts receivable, net of allowance for doubtful accounts of $75	789	203
Costs and estimated earnings in excess of billings on uncompleted contracts	726	32
Deferred cost of revenue	6	113
Inventories	2,659	436
Other current assets	238	132
Total current assets	7,451	5,296
Equipment, furniture and fixtures, net	482	432
Other noncurrent assets	49	65
Total assets	7,982	5,793
Current liabilities:
Accounts payable	1,070	152
Billings in excess of costs and estimated earnings on uncompleted contracts	0	231
Accrued payroll and related taxes	388	326
Warranty reserves	169	31
Payable to Parent	252	251
Other current liabilities	63	67
Deferred revenues	687	615
Total current liabilities	2,629	1,673
Long-term liabilities	12	12
Total liabilities	2,641	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	(51,029)	(52,262)
Total shareholders' equity	5,341	4,108
Total liabilities and shareholders' equity	$ 7,982	$ 5,793