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Condensed Consolidated Statements of Cash Flows(unaudited) (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 2,607,052	$ 1,781,032
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	1,940,827	1,660,832
Stock-based compensation expense	582,307	612,207
Deferred income taxes	828,703	609,059
Provision for doubtful accounts		272,723
Provision for inventory	537,657	524,820
Changes in operating assets and liabilities:
Accounts receivable	(1,618,730)	(4,515,640)
Inventories	(536,642)	(603,329)
Prepaid expenses, other current and long-term assets	(366,213)	720,265
Long-term deposits and other	16,998	7,549
Accounts payable	(2,642,810)	338,639
Accrued expenses	(510,426)	829,230
Deferred revenue	(1,342,473)	(1,401,468)
Income taxes payable	411,843
Other long-term liabilities	(18,592)	(56,580)
Net cash (used in) provided by operating activities	(110,499)	779,339
Cash flows from investing activities:
Purchase of property and equipment, net	(655,784)	(1,012,299)
Reduction in purchase price of subsidiary		105,300
Net cash used in investing activities	(655,784)	(906,999)
Cash flows from financing activities:
Principal payments on debt	(800,000)	(800,000)
Proceeds from exercise of stock options	151,767	197,243
Net cash used in financing activities	(648,233)	(602,757)
Exchange rate impact on cash	41,613	(47,751)
Decrease in cash and cash equivalents	(1,372,903)	(778,168)
Cash and cash equivalents at beginning of period	28,201,932	24,426,990
Cash and cash equivalents at end of period	$ 26,829,029	$ 23,648,822

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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- Definition

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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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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