CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Current assets:
Cash and cash equivalents	$ 7,259	$ 2,783
Certificates of deposit	1,245	250
Accounts receivable, net of allowance for doubtful accounts of $75	2,054	789
Costs and estimated earnings in excess of billings on uncompleted contracts	0	726
Deferred cost of revenue	132	6
Inventories	3,665	2,659
Deferred income taxes	1,555	0
Other current assets	298	238
Total current assets	16,208	7,451
Equipment, furniture and fixtures, net	573	482
Other noncurrent assets	53	49
Total assets	16,834	7,982
Current liabilities:
Accounts payable	2,180	1,070
Accrued payroll and related taxes	384	388
Warranty reserves	139	169
Payable to Parent	202	252
Other current liabilities	38	63
Deferred revenues	5,451	687
Total current liabilities	8,394	2,629
Long-term liabilities	0	12
Total liabilities	8,394	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	(47,930)	(51,029)
Total shareholders' equity	8,440	5,341
Total liabilities and shareholders' equity	$ 16,834	$ 7,982