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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income $ 841,326 $ 413,841
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization expense 290,508 217,263
Deferred tax expense 65,413 0
Share-based compensation 128,625 214,381
Excess tax benefit derived from exercise of stock options (478,698) (191,081)
Noncash interest expense 6,019 6,019
Noncash investment gains (losses) 10,571 (8,800)
Net changes in assets and liabilities affecting operating activities:    
Accounts receivable 49,570 2,619,523
Inventory 226,324 (230,784)
Other current assets and other assets 8,298 324,954
Accounts payable and other current liabilities 492,983 (282,862)
Other long-term liabilities 46,308 178,120
Net cash provided by operating activities 1,670,651 2,610,666
Cash flows from investing activities:    
Additions to property and equipment (60,911) (32,800)
Purchases of marketable securities (2,970,000) (15,992,822)
Proceeds from sale of marketable securities 686,755 0
Additions to intangible assets (961,013) (180,787)
Net cash used in investment activities (3,305,169) (16,206,409)
Cash flows from financing activities:    
Net borrowings on line of credit 0 250,000
Proceeds from exercise of stock options (41,292) 545,601
Excess tax benefit derived from exercise of stock options 478,698 191,081
Repurchase of common shares (1,942,725) (2,346,524)
Net cash used in financing activities (1,505,319) (1,359,842)
Net decrease in cash and cash equivalents (3,139,837) (14,955,585)
Cash and cash equivalents at beginning of period 54,349,381 70,599,146
Cash and cash equivalents at end of period 51,209,544 55,643,561
Non-cash investing and financing activities:    
Net change in unpaid additions to intangibles, property and equipment $ 160,272 $ 82,696