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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net (loss) income $ (2,151,418) $ 5,806,206 $ 5,626,513
Adjustments to reconcile net (loss) income to net cash flows provided by operating activities:      
Depreciation and amortization expense 1,301,835 901,649 1,040,407
Deferred tax (benefit) expense (1,579,918) (829,846) 1,665,110
Share-based compensation 674,955 636,528 779,305
Excess tax benefit derived from exercise of stock options (48,024) (3,760,766) (2,355,345)
Noncash interest expense 24,075 24,075 137,487
Noncash investment losses (gains) 178,822 (45,814) 0
Net changes in assets and liabilities affecting operating activities:      
Accounts receivable 1,486,777 1,065,689 (1,937,396)
Inventories 495,473 (443,661) 1,909,148
Prepaid, other current assets and other assets 117,021 (648,941) (399,393)
Accounts payable and other accrued liabilities 58,855 4,373,276 2,296,535
Other long-term liabilities 187,673 56,787 (40,224)
Net cash provided by operating activities 746,126 7,135,182 8,722,147
Cash flows from investing activities:      
Additions to property and equipment (97,412) (464,893) (257,502)
Additions to intangible assets (7,462,080) (2,071,926) (180,269)
Proceeds from sale of marketable securities 6,859,061 5,220,480 0
Purchases of marketable securities (4,371,508) (21,860,802) 0
Net cash used in investing activities (5,071,939) (19,177,141) (437,771)
Cash flows from financing activities:      
Net (repayments) borrowings on line of credit (4,359,951) (500,000) 3,034,000
Principal payments on note payable 0 0 (5,333,333)
Repurchase of common shares (4,800,908) (8,086,594) (4,247,440)
Costs of financing for long-term debt and credit facility 0 0 (17,637)
Exercise of stock options (41,276) 618,022 629,865
Excess tax benefit derived from exercise of stock options 48,024 3,760,766 2,355,345
Net cash used in financing activities (9,154,111) (4,207,806) (3,579,200)
Net (decrease) increase in cash and cash equivalents (13,479,924) (16,249,765) 4,705,176
Cash and cash equivalents, beginning of year 54,349,381 70,599,146 65,893,970
Cash and cash equivalents, end of year 40,869,457 54,349,381 70,599,146
Cash paid during the year for:      
Interest 79,347 47,910 191,410
Income taxes (129,509) 112,381 304,480
Noncash investing and financing activities:      
Change in unpaid invoices for purchases of intangibles $ 543,905 $ 888,141 $ 97,806