CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2013		Jul. 31, 2012
Cash flows from operating activities:
Net income	$ 670		$ 916
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	46		41
Warranty reserve expense	171		65
Loss on disposal of construction in progress	25		0
Deferred income taxes	405		0
Changes in operating assets and liabilities:
Accounts receivable	276		(168)
Costs and estimated earnings in excess of billings on uncompleted contracts	0		(957)
Deferred cost of revenue	(59)		3
Inventories	621		550
Other current assets	101		111
Accounts payable	(1,115)		(799)
Accrued payroll and related taxes	57		54
Warranty reserves	(54)		(60)
Other liabilities	30		(30)
Deferred revenues	(1,720)		(11)
Net cash used in operating activities	(546)		(285)
Cash flows from investing activities:
Proceeds from redemption of certificates of deposit	0		250
Additions to equipment, furniture and fixtures	(79)		(64)
Net cash (used in) provided by investing activities	(79)		186
Net decrease in cash and cash equivalents	(625)		(99)
Cash and cash equivalents at beginning of period	7,259	[1]	2,783
Cash and cash equivalents at end of period	6,634		2,684
Supplemental cash flow information:
Cash paid for income taxes	$ 0		$ 25

[1] Derived from the consolidated audited financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended April 30, 2013 filed with the SEC.