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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income $ 3,580,615 $ 859,649 $ 8,273,212
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for doubtful accounts 535,617 275,526 280,578
Depreciation and amortization 4,609,654 4,374,169 3,845,016
Deferred income taxes 2,046,278 (737,496) (3,133,858)
Loss on interest rate swaps 128,102 132,589 102,572
Compensation expense related to stock-based awards and employee stock purchase plan 3,679,248 3,532,909 2,523,799
Changes in operating assets and liabilities:      
Accounts receivable (2,230,743) (7,438,392) (2,660,238)
Inventories 2,420,196 (3,850,824) (1,215,185)
Prepaid expenses and other assets (716,697) 164,089 (1,078,556)
Other non-current assets (557,820) 2,028,341 645,674
Accounts payable 942,852 2,223,153 178,539
Deferred revenue (785,415) 1,683,950 (43,713)
Accrued expenses 1,400,873 (253,089) 1,499,612
Other long-term liabilities 4,245 (1,127,359) 360,411
Net cash provided by operating activities 15,057,005 1,867,215 9,577,863
Cash flows from investing activities:      
Capital expenditures (6,504,094) (14,064,106) (11,010,756)
Net cash paid for business acquired 0 0 (6,365,518)
Purchases of marketable securities (21,944,408) (49,541,143) (87,886,677)
Maturities and sales of marketable securities 16,189,864 56,053,571 93,207,446
Net cash used in investing activities (12,258,638) (7,551,678) (12,055,505)
Cash flows from financing activities:      
Repayments of long-term debt (130,857) (123,870) (117,256)
Proceeds from stock options exercised and employee stock purchase plan 1,578,172 941,537 4,423,918
Repurchase of common stock 0 (3,679,127) 0
Payment of employee restricted stock withholdings (332,710) (624,533) (480,786)
Repayments of line of credit borrowings (2,000,000) 0 0
Proceeds from line of credit borrowings 0 9,000,000 0
Payment of stock registration fee 0 (10,000) (6,962)
Net cash (used in) provided by financing activities (885,395) 5,504,007 3,818,914
Effect of exchange rate changes on cash and cash equivalents 47,986 (43,534) 29,145
Net increase (decrease) in cash and cash equivalents 1,960,958 (223,990) 1,370,417
Cash and cash equivalents at beginning of period 7,017,198 7,241,188 5,870,771
Cash and cash equivalents at end of period 8,978,156 7,017,198 7,241,188
Supplemental disclosure of cash flow information:      
Cash paid for interest 200,624 267,281 189,931
Cash paid for income taxes 322,856 57,968 881,025
Supplemental disclosure of noncash investing activity:      
Changes in accrued liabilities related to fixed asset additions $ 435,000 $ 944,649 $ 0