CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 31, 2014		Oct. 31, 2013
Cash flows from operating activities:
Net (loss) income	$ (523)		$ 2,634
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation and amortization	113		95
Warranty (adjustment) reserve expense	(63)		260
Loss on disposal of equipment	0		25
Deferred income taxes	0		1,521
Changes in operating assets and liabilities:
Accounts receivable	493		(1,084)
Costs and estimated earnings in excess of billings on uncompleted contracts	(17)		0
Deferred cost of revenues	0		130
Inventories	(302)		1,468
Other current and noncurrent assets	(192)		185
Accounts payable	442		(1,438)
Accrued payroll and related taxes	(198)		7
Warranty reserves	(28)		(61)
Other liabilities	206		88
Deferred revenues	(7)		(4,199)
Net cash used in operating activities	(76)		(369)
Cash flows from investing activities:
Proceeds from redemption of certificates of deposit	0		747
Additions to equipment, furniture and fixtures	(48)		(93)
Net cash (used in) provided by investing activities	(48)		654
Net (decrease) increase in cash and cash equivalents	(124)		285
Cash and cash equivalents at beginning of period	10,444	[1]	7,259
Cash and cash equivalents at end of period	10,320		7,544
Supplemental cash flow information:
Cash paid for income taxes	$ 10		$ 73

[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, 2014 filed with the SEC.