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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income $ 192,472 $ 2,150,095
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization expense 610,052 441,199
Deferred tax expense 65,413 0
Share-based compensation 305,199 390,788
Excess tax benefit derived from exercise of stock options (15,288) (854,988)
Noncash interest expense 12,038 12,038
Noncash investment (gains) losses 62,323 (34,604)
Net changes in assets and liabilities affecting operating activities:    
Accounts receivable 2,046,259 2,091,278
Inventory 124,061 (1,541,912)
Other current assets and other assets 59,877 (173,889)
Accounts payable and other current liabilities (1,707,560) 1,362,385
Other long-term liabilities 37,479 (596,911)
Net cash provided by operating activities 1,792,325 3,245,479
Cash flows from investing activities:    
Additions to property and equipment (69,119) (178,886)
Purchases of marketable securities (4,371,508) (18,356,482)
Proceeds from sale of marketable securities 1,481,682 145,646
Additions to intangible assets (1,829,693) (519,719)
Net cash used in investment activities (4,788,638) (18,909,441)
Cash flows from financing activities:    
Net borrowings (repayments) on line of credit 1,500,000 (500,000)
Exercise of stock options (41,292) 545,601
Excess tax benefit derived from exercise of stock options 15,288 854,988
Repurchase of common shares (3,162,302) (3,562,381)
Net cash used in financing activities (1,688,306) (2,661,792)
Net decrease in cash and cash equivalents (4,684,619) (18,325,754)
Cash and cash equivalents at beginning of period 54,349,381 70,599,146
Cash and cash equivalents at end of period 49,664,762 52,273,392
Non-cash investing and financing activities:    
Net change in unpaid additions to intangibles, property and equipment $ 249,633 $ 73,457