CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income	$ 2,920	$ 2,772
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Write-off of engineering project development qualification units	111
Depreciation and amortization	1,113	1,135
Non-cash reserve accretion	299	317
Stock based compensation	609	535
Provision for losses on accounts receivable	13	16
Deferred taxes-net	1,851	1,924
Changes in assets and liabilities:
Decrease in accounts receivable and other receivables	9,386	2,700
Increase in inventories	(6,152)	(5,832)
(Increase) decrease in other assets	(1,563)	496
(Decrease) increase in accounts payable	(282)	634
Increase (decrease) in accrued compensation	306	(91)
(Decrease) increase in accrued income taxes	(129)	19
Decrease in other liabilities	(429)	(346)
Net cash provided by operating activities	8,053	4,279
Cash flows from investing activities:
Capital expenditures	(265)	(627)
Capitalized qualification units		(1,638)
Net cash used in investing activities	(265)	(2,265)
Cash flows from financing activities:
Payments on long-term debt	(10,679)	(821)
Net borrowings (repayments) of other debt
Exercise of stock options	41	194
Net cash used in financing activities	(10,638)	(627)
(Decrease) increase in cash	(2,850)	1,387
Cash at beginning of period	12,683	6,381
Cash at end of period	9,833	7,768
Supplemental information:
Interest payments	83	253
Income tax payments	460	171
Non-cash financing activity for stock option exercise	$ 122	$ 82