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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 $ 5,806,206 $ 5,626,513 $ 2,427,011
Adjustments to reconcile net income to net cash flows provided by operating activities:      
Depreciation and amortization expense 901,649 1,040,407 978,398
Deferred tax (benefit) expense (829,846) 1,665,110 (332,349)
Share-based compensation 636,528 779,305 768,630
Excess tax benefit derived from exercise of stock options (3,760,766) (2,355,345) (3,874,966)
Noncash interest expense 24,075 137,487 352,484
Noncash investment gains (45,814) 0 0
Net changes in assets and liabilities affecting operating activities:      
Accounts receivable 1,065,689 (1,937,396) 1,031,091
Inventory (443,661) 1,909,148 (2,860,969)
Prepaid, other current assets and other assets (648,941) (399,393) 1,342,032
Accounts payable and other accrued liabilities 4,373,276 2,296,535 201,725
Other long-term liabilities 56,787 (40,224) 313,575
Net cash provided by operating activities 7,135,182 8,722,147 346,662
Cash flows from investing activities:      
Additions to property and equipment (464,893) (257,502) (577,159)
Additions to intangible assets (2,071,926) (180,269) (191,483)
Proceeds from sale of marketable securities 5,220,480 0 0
Purchases of marketable securities (21,860,802) 0 0
Net cash used in investing activities (19,177,141) (437,771) (768,642)
Cash flows from financing activities:      
Net (repayments) borrowings on line of credit (500,000) 3,034,000 0
Principal payments on note payable 0 (5,333,333) (12,666,667)
Payments made in connection with repurchase of common shares (8,086,594) (4,247,440) (4,846,791)
Costs of financing for long-term debt and credit facility 0 (17,637) (110,000)
Proceeds from exercise of stock options 618,022 629,865 1,362,760
Excess tax benefit derived from exercise of stock options 3,760,766 2,355,345 3,874,966
Net cash used in financing activities (4,207,806) (3,579,200) (12,385,732)
Net (decrease) increase in cash and cash equivalents (16,249,765) 4,705,176 (12,807,712)
Cash and cash equivalents, beginning of year 70,599,146 65,893,970 78,701,682
Cash and cash equivalents, end of year 54,349,381 70,599,146 65,893,970
Cash paid during the year for:      
Interest 47,910 191,410 814,373
Income taxes 112,381 304,480 52,136
Noncash investing and financing activities:      
Change in unpaid invoices for purchases of intangibles 888,141 97,806 0
Reclass of redeemable common stock to (from) equity $ 0 $ 0 $ 1,930,000