Consolidated Statements Of Cash Flows (USD $) In Thousands	3 Months Ended
Aug. 31, 2011	Aug. 31, 2010
Cash flows from operating activities:
Net income	$ 1,373	$ 1,888
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,132	3,029
Amortization of bond discounts and premiums	16
Tax effect on exercise of stock options and issuance of performance shares	(240)	9
Deferred income taxes	911	875
Change in allowance for excess and obsolete inventory	(64)	(266)
Stock based compensation	799	1,219
Change in accounts receivable allowances	54	(5)
Other	(162)	115
Changes in operating assets and liabilities:
Accounts receivable	722	6,206
Inventories	(1,727)	(4,035)
Prepaid expenses and other	(153)	379
Accounts payable and accrued liabilities	(1,617)	(7,676)
Net cash provided by operating activities	3,044	1,738
Cash flows from investing activities:
Additions to property, plant and equipment	(541)	(662)
Proceeds from sale of assets	1,000
Purchases of marketable securities	(42,303)	(8,065)
Proceeds from sale or maturity of marketable securities	41,560	14,602
Net cash (used in) provided by investing activities	(284)	5,875
Cash flows from financing activities:
Repayment of long-term debt	(65)	(65)
Proceeds from exercise of stock options and employee stock purchase plan	1,804	850
Net cash provided by financing activities	1,739	785
Effect of exchange rate changes on cash and cash equivalents	10	41
Increase in cash and cash equivalents	4,509	8,439
Cash and cash equivalents at beginning of period	45,984	58,763
Cash and cash equivalents at end of period	$ 50,493	$ 67,202

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Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified stock options) recognized on the entity's tax return exceeds compensation cost from non-qualified stock options recognized on the income statement. This element increases net cash provided by operating activities.

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