Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating activities
Net loss	$ (219)	$ (536)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	927	762
Stock-based compensation expense	352	248
Deferred income tax benefit	(424)	(776)
Change in allowance for notes and accounts receivable	55	(47)
Other	13	19
Changes in operating assets and liabilities:
Accounts receivable, current and long-term	(4,312)	3,143
Inventories	(2,667)	(4,036)
Prepaid expenses and other current assets	316	(3,215)
Deferred revenue	868
Accounts payable	4,074	(1,309)
Accrued expenses	220	(533)
Net cash used in operating activities	(797)	(6,280)
Investing activities
Purchase of property and equipment	(983)	(582)
Purchase of property and equipment held under operating leases	(3)	(4)
Purchase of short-term investments	(1)	(7)
Proceeds from asset sales	1
Additions to patents and licenses	(45)	(35)
Long term investments		(206)
Net cash used in investing activities	(1,031)	(834)
Financing activities
Payment of long-term debt	(262)	(133)
Proceeds from debt	2,831
Proceeds from repayment of shareholders notes	2
Excess tax benefits from stock-based compensation	159
Deferred financing costs	(3)	(57)
Proceeds from issuance of common stock	98	136
Net cash provided by (used in) financing activities	2,825	(54)
Net (decrease) increase in cash and cash equivalents	997	(7,168)
Cash and cash equivalents at beginning of period	11,560	23,364
Cash and cash equivalents at end of period	12,557	16,196
Supplemental cash flow information:
Cash paid for interest	72	63
Cash paid for income taxes	38	28
Supplemental disclosure of non-cash investing and financing activities:
Shares surrendered into treasury from stock option exercise		51
Shares issued from treasury for stock note receivable	$ 35