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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income $ 5,626,513 $ 2,427,011 $ 3,058,879
Adjustments to reconcile net income to net cash flows provided by operating activities:      
Depreciation and amortization expense 1,040,407 978,398 816,499
Deferred tax expense (benefit) 1,665,110 (332,349) (525,467)
Stock-based compensation - nonemployees 149,719 80,222 1,056,401
Stock-based compensation - employees 629,586 688,408 606,395
Excess tax benefit derived from exercise of stock options (2,355,345) (3,874,966) (3,968,894)
Noncash interest expense 137,487 352,484 128,800
Net changes in assets and liabilities affecting operating activities:      
Accounts receivable (1,937,396) 1,031,091 (3,047,238)
Inventory 1,909,148 (2,860,969) (3,060,097)
Prepaid, other current assets and other assets (399,393) 1,342,032 (721,464)
Accounts payable and other accrued liabilities 2,296,535 201,725 6,572,098
Other long-term obligations (40,224) 313,575 (510,942)
Net cash provided by operating activities 8,722,147 346,662 404,970
Cash flows from investing activities:      
Additions to property and equipment (257,502) (577,159) (601,802)
Additions to trademarks and patents (180,269) (191,483) (110,541)
Net cash used in investing activities (437,771) (768,642) (712,343)
Cash flows from financing activities:      
Proceeds from initial public offering of common stock     85,000,000
Costs of initial public offering     (7,479,011)
Proceeds from borrowings on long-term debt     18,000,000
Principal payments on note payable (5,333,333) (12,666,667) (5,000,000)
Net borrowings on line of credit 3,034,000    
Costs of financing for long-term debt and credit facility (17,637) (110,000) (189,660)
Payments made in connection with repurchase of common shares (4,247,440) (4,846,791) (27,295,808)
Proceeds from exercise of stock options 629,865 1,362,760 175,089
Excess tax benefit derived from exercise of stock options 2,355,345 3,874,966 3,968,894
Net cash (used in) provided by financing activities (3,579,200) (12,385,732) 67,179,504
Net increase (decrease) in cash and cash equivalents 4,705,176 (12,807,712) 66,872,131
Cash and cash equivalents, beginning of year 65,893,970 78,701,682 11,829,551
Cash and cash equivalents, end of year 70,599,146 65,893,970 78,701,682
Cash paid during the year for:      
Interest 191,410 814,373 677,387
Income taxes 304,480 52,136 196,187
Noncash investing and financing activities:      
Change in unpaid invoices for purchases of intangibles 97,806    
Reclass of redeemable common stock to (from) equity   1,930,000 (1,930,000)
Deferred financing costs     $ 335,075