CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 31, 2013		Oct. 31, 2012
Cash flows from operating activities:
Net income	$ 2,634		$ 1,388
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	95		87
Warranty reserve expense	260		73
Loss on disposal of equipment	25		0
Deferred income taxes	1,521		0
Changes in operating assets and liabilities:
Accounts receivable	(1,084)		(2,189)
Costs and estimated earnings in excess of billings on uncompleted contracts	0		726
Deferred cost of revenues	130		(8)
Inventories	1,468		1,124
Other current and noncurrent assets	185		41
Accounts payable	(1,438)		(907)
Billings in excess of costs and estimated earnings on uncompleted contracts	0		453
Accrued payroll and related taxes	7		1
Warranty reserves	(61)		(131)
Other liabilities	88		(29)
Deferred revenues	(4,199)		(36)
Net cash (used in) provided by operating activities	(369)		593
Cash flows from investing activities:
Proceeds from redemption of certificates of deposit	747		250
Additions to equipment, furniture and fixtures	(93)		(175)
Net cash provided by investing activities	654		75
Net increase in cash and cash equivalents	285		668
Cash and cash equivalents at beginning of period	7,259	[1]	2,783
Cash and cash equivalents at end of period	7,544		3,451
Supplemental cash flow information:
Cash paid for income taxes	$ 73		$ 37

[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.