CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 31, 2014		Jan. 31, 2013
Cash flows from operating activities:
Net income	$ 3,584		$ 1,299
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	139		133
Warranty reserve expense	170		75
Loss on disposal of equipment	25		0
Deferred income taxes	1,555		0
Changes in operating assets and liabilities:
Accounts receivable	1,428		(116)
Costs and estimated earnings in excess of billings on uncompleted contracts	0		666
Deferred cost of revenues	131		3
Inventories	2,234		1,089
Other current and noncurrent assets	121		(215)
Accounts payable	(1,389)		(845)
Accrued payroll and related taxes	(63)		94
Warranty reserves	(91)		(137)
Other liabilities	308		(33)
Deferred revenues	(4,666)		1,721
Net cash provided by operating activities	3,486		3,734
Cash flows from investing activities:
Proceeds from redemption of certificates of deposit	996		250
Additions to equipment, furniture and fixtures	(132)		(217)
Net cash provided by investing activities	864		33
Net increase in cash and cash equivalents	4,350		3,767
Cash and cash equivalents at beginning of period	7,259	[1]	2,783
Cash and cash equivalents at end of period	11,609		6,550
Supplemental cash flow information:
Cash paid for income taxes	$ 243		$ 43

[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.