Statements of Consolidated Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Cash flows from operating activities:
Net income (loss)	$ 3,776	$ 5,026	$ (6,043)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Loss on disposal of property and equipment		29
Write-off of engineering project development	4,429
Depreciation and amortization	1,709	2,271	1,587
Non-cash interest expense	419	435	129
Stock based compensation	675	454	796
Provision for losses on accounts receivable	62	85	122
Deferred taxes-net	2,654	3,177	(1,302)
Changes in assets and liabilities:
(Increase) decrease in accounts receivable and other receivables	(943)	(5,601)	7,110
Decrease (increase) in inventories	(227)	2,614	2,270
(Increase) decrease in other assets	511	(185)	(905)
Increase (decrease) in accounts payable	(2,262)	2,463	(733)
Increase (decrease) in other liabilities	(1,151)	336	8,647
Net cash provided by operating activities	9,652	11,104	11,678
Cash flows from investing activities:
Capital (expenditures) reimbursements - relocation		72	(6,208)
Capital expenditures - operations	(726)	(787)	(438)
Capitalized Qualification units	(1,997)	(807)	(1,043)
Net cash used in investing activities	(2,723)	(1,522)	(7,689)
Cash flows from financing activities:
Payments on long-term debt	(821)	(6,572)	(3,285)
Proceeds from long-term debt and borrowings	0	0	0
(Repayments) of other debt	0	0	0
Exercise of stock options	194
Net cash used in financing activities	(627)	(6,572)	(3,285)
Increase in cash	6,302	3,010	704
Cash at beginning of year	6,381	3,371	2,667
Cash at end of year	12,683	6,381	3,371
Supplemental information:
Interest payments	305	588	771
Income tax payments	176	87	127
Non-cash financing activity for stock option exercise	$ 82