Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 5,648,987	$ 2,607,052
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	2,182,129	1,940,827
Stock-based compensation expense	633,073	582,307
Deferred income taxes	14,036	828,703
Provision for doubtful accounts	135,353
Provision for inventory	164,300	537,657
Tax benefit from exercise of stock options	(400,325)
Changes in operating assets and liabilities:
Accounts receivable	(892,265)	(1,618,730)
Inventories	(3,713,817)	(536,642)
Prepaid expenses, other current and long-term assets	590,614	(366,213)
Long-term deposits and other	16,997	16,998
Accounts payable	(170,035)	(2,642,810)
Accrued expenses	(920,168)	(510,426)
Deferred revenue	(1,433,334)	(1,342,473)
Income taxes payable	1,679,579	411,843
Other long-term liabilities	(335)	(18,592)
Net cash provided by (used in) operating activities	3,534,789	(110,499)
Cash flows from investing activities:
Purchase of property and equipment	(1,145,493)	(655,784)
Net cash used in investing activities	(1,145,493)	(655,784)
Cash flows from financing activities:
Principal payments on debt	(800,000)	(800,000)
Proceeds from exercise of stock options	147,033	151,767
Tax benefit from exercise of stock options	400,325
Net cash used in financing activities	(252,642)	(648,233)
Exchange rate impact on cash	(4,268)	41,613
Increase (decrease) in cash and cash equivalents	2,132,386	(1,372,903)
Cash and cash equivalents at beginning of period	35,777,222	28,201,932
Cash and cash equivalents at end of period	$ 37,909,608	$ 26,829,029