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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net income (loss) $ 1,713,902 $ (640,023)
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization expense 1,383,611 917,012
Deferred tax benefit (36,255) (76,332)
Share-based compensation 542,118 480,806
Excess tax (benefit) expense derived from exercise of stock options (1,077,099) 511,908
Noncash interest expense 12,038 12,038
Noncash investment losses 138,627 135,296
Net changes in assets and liabilities affecting operating activities, net of effect of business combination:    
Accounts receivable (765,689) 1,822,786
Inventory 1,002,160 782,742
Other current assets and other assets (1,354,793) (177,754)
Accounts payable and other current liabilities 2,293,818 (2,942,455)
Other long-term liabilities 105,416 112,737
Net cash provided by operating activities 3,957,854 938,761
Cash flows from investing activities:    
Additions to property and equipment (150,387) (92,435)
Purchases of marketable securities (3,754,903) (4,371,508)
Proceeds from sale of marketable securities 3,001,735 1,758,906
Cash paid for acquisitions (2,000,000) 0
Additions to intangible assets (1,617,874) (2,600,266)
Net cash used in investment activities (4,521,429) (5,305,303)
Cash flows from financing activities:    
Net borrowings on line of credit 0 500,000
Exercise of stock options 0 (41,292)
Excess tax benefit (expense) derived from exercise of stock options 1,077,099 (511,908)
Sale of subsidiary shares to noncontrolling interest 1,000,005 0
Repurchase of common shares (2,738,905) (3,918,436)
Net cash used in financing activities (661,801) (3,971,636)
Net decrease in cash and cash equivalents (1,225,376) (8,338,178)
Cash and cash equivalents at beginning of period 40,869,457 54,349,381
Cash and cash equivalents at end of period 39,644,081 46,011,203
Non-cash investing and financing activities:    
Net change in unpaid additions to intangibles, property and equipment $ 974,809 $ 230,522