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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net income $ 542,512 $ 1,713,902
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization expense 1,677,906 1,383,611
Deferred tax benefit (expense) 43,991 (36,255)
Share-based compensation 426,651 542,118
Excess tax benefit derived from exercise of stock options (470,584) (1,077,099)
Noncash interest expense 33,001 12,038
Noncash investment (gains) losses (80,321) 138,627
Net changes in assets and liabilities affecting operating activities, net of effect of business combination:    
Accounts receivable (293,665) (765,689)
Inventory 1,394,280 1,002,160
Other current assets and other assets (239,484) (1,354,793)
Accounts payable and other current liabilities 1,457,656 2,293,818
Other long-term liabilities 61,553 105,416
Net cash provided by operating activities 4,553,496 3,957,854
Cash flows from investing activities:    
Additions to property and equipment (96,768) (150,387)
Purchases of marketable securities (5,201,240) (3,754,903)
Proceeds from sale of marketable securities 5,684,149 3,001,735
Cash paid for acquisitions 0 (2,000,000)
Additions to intangible assets (2,392,477) (1,617,874)
Net cash used in investing activities (2,006,336) (4,521,429)
Cash flows from financing activities:    
Net borrowings on line of credit 1,700,000 0
Exercise of stock options 21,366 0
Excess tax benefit derived from exercise of stock options 470,584 1,077,099
Cash settlement of contingent consideration (1,618,983) 0
Sale of subsidiary shares to noncontrolling interest 0 1,000,005
Repurchase of common shares (4,669,873) (2,738,905)
Net cash used in financing activities (4,096,906) (661,801)
Net decrease in cash and cash equivalents (1,549,746) (1,225,376)
Cash and cash equivalents at beginning of period 39,866,037 40,869,457
Cash and cash equivalents at end of period 38,316,291 39,644,081
Non-cash investing and financing activities:    
Net change in unpaid additions to intangibles, property and equipment $ 1,266,759 $ 974,809