CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Apr. 30, 2012
Current assets:
Cash and cash equivalents	$ 2,684	$ 2,783
Certificates of deposit	0	250
Accounts receivable, net of allowance for doubtful accounts of $75	957	789
Costs and estimated earnings in excess of billings on uncompleted contracts	1,683	726
Deferred cost of revenue	3	6
Inventories	2,109	2,659
Other current assets	127	238
Total current assets	7,563	7,451
Equipment, furniture and fixtures, net	505	482
Other noncurrent assets	49	49
Total assets	8,117	7,982
Current liabilities:
Accounts payable	271	1,070
Accrued payroll and related taxes	442	388
Warranty reserves	174	169
Payable to Parent	252	252
Other current liabilities	38	63
Deferred revenues	676	687
Total current liabilities	1,853	2,629
Long-term liabilities	7	12
Total liabilities	1,860	2,641
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	(50,113)	(51,029)
Total shareholders' equity	6,257	5,341
Total liabilities and shareholders' equity	$ 8,117	$ 7,982