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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net income $ 413,841 $ 711,283
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization expense 217,263 262,306
Stock-based compensation - nonemployees 70,871 19,856
Stock-based compensation - employees 143,510 147,207
Excess tax benefit derived from exercise of stock options (191,081) (141,080)
Noncash interest expense 6,019 24,010
Net unrealized investment gains (8,800)  
Net changes in assets and liabilities affecting operating activities:    
Accounts receivable 2,619,523 (96)
Inventory (230,784) (139,030)
Other current assets and other assets (324,954) 126,084
Accounts payable and other accrued liabilities (282,862) (23,990)
Other long-term liabilities 178,120 (2,570)
Net cash provided by operating activities 2,610,666 983,980
Cash flows from investing activities:    
Additions to property and equipment (32,800) (34,260)
Purchases of marketable securities (15,992,822)  
Additions to intangibles (180,787) (20,289)
Net cash used in investment activities (16,206,409) (54,549)
Cash flows from financing activities:    
Principal payments on note payable   (666,667)
Net borrowings on line of credit 250,000  
Proceeds from exercise of stock options 545,601 433,055
Excess tax benefit derived from exercise of stock options 191,081 141,080
Payments made in connection with repurchase of common shares (2,346,524) (772,025)
Net cash used in financing activities (1,359,842) (864,557)
Net (decrease) increase in cash and cash equivalents (14,955,585) 64,874
Cash and cash equivalents at beginning of period 70,599,146 65,893,970
Cash and cash equivalents at end of period 55,643,561 65,958,844
Non-cash investing and financing activities:    
Change in unpaid fixed asset additions   26,689
Change in unpaid intangible additions $ 82,696