Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 598	$ 589
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on disposal of property and equipment		4
Depreciation and amortization	376	470
Non-cash reserve accretion	106	108
Stock based compensation	136	119
Provision for losses on accounts receivable	13	4
Deferred taxes-net	393	343
Changes in assets and liabilities:
Decrease (increase) in accounts receivable and other receivables	5,745	(2,782)
(Increase) decrease in inventories	(2,582)	465
(Increase) decrease in other assets	(2)	281
Increase in accounts payable	1,940	582
Increase (decrease) in accrued compensation	250	(19)
Increase in accrued income taxes	1	41
Decrease in other liabilities	(1,098)	(158)
Net cash provided by operating activities	5,876	47
Cash flows from investing activities:
Capital expenditures	(713)	(174)
Capitalized Qualification units	(467)	(61)
Net cash (used in) investing activities	(1,180)	(235)
Cash flows from financing activities:
Payments on long-term debt	(821)	(822)
Net borrowings (repayments) of other debt	0	0
Exercise of stock options	194
Net cash (used in) financing activities	(627)	(822)
Increase (decrease) in cash	4,069	(1,010)
Cash at beginning of period	6,381	3,371
Cash at end of period	10,450	2,361
Supplemental information:
Interest payments	112	162
Income tax payments	40	42
Non-cash financing activity for stock option exercise	$ 82