CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Cash flows from operating activities:
Net income	$ 3,096	$ 3,099
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	188	181
Deferred income taxes	1,555	(1,555)
Warranty reserve expense	174	153
Gain on disposal of equipment	(29)	0
Changes in operating assets and liabilities:
Accounts receivable	1,342	(1,265)
Costs and estimated earnings in excess of billings on uncompleted contracts	0	726
Deferred cost of revenues	129	(126)
Inventories	2,267	(1,137)
Other current and noncurrent assets	85	(64)
Accounts payable	(1,783)	1,110
Accrued payroll and related taxes	256	(4)
Warranty reserves	(125)	(183)
Payable to Parent	(50)	(50)
Other liabilities	14	(37)
Deferred revenues	(4,981)	4,764
Net cash provided by operating activities	2,138	5,612
Cash flows from investing activities:
Purchases of certificates of deposit	0	(1,245)
Proceeds from redemption of certificates of deposit	1,245	250
Additions to equipment, furniture and fixtures	(233)	(141)
Proceeds from sale of equipment	35	0
Net cash provided by (used in) investing activities	1,047	(1,136)
Net increase in cash and cash equivalents	3,185	4,476
Cash and cash equivalents at beginning of year	7,259	2,783
Cash and cash equivalents at end of year	10,444	7,259
Supplemental cash flow information:
Cash paid for income taxes	287	48
Non-cash inventory activities:
Inventory transferred to equipment	$ 0	$ 131