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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net income (loss) $ (234,007) $ 542,512
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization expense 1,785,057 1,677,906
Deferred tax benefit 662,689 43,991
Share-based compensation 623,504 426,651
Excess tax expense (benefit) derived from exercise of stock options 907,270 (470,584)
Noncash interest expense 61,224 33,001
Noncash investment gains (69,140) (80,321)
Net changes in assets and liabilities affecting operating activities:    
Accounts receivable (595,180) (293,665)
Inventory (713,084) 1,394,280
Other current assets and other assets (1,241,372) (239,484)
Accounts payable and other current liabilities (1,705,007) 1,457,656
Other long-term liabilities 267,730 61,553
Net cash (used in) provided by operating activities (250,316) 4,553,496
Cash flows from investing activities:    
Additions to property and equipment (98,275) (96,768)
Purchases of marketable securities (3,643,894) (5,201,240)
Proceeds from sale of marketable securities 3,676,745 5,684,149
Additions to intangible assets (1,554,410) (2,392,477)
Net cash used in investing activities (1,619,834) (2,006,336)
Cash flows from financing activities:    
Net borrowings on line of credit 2,000,000 1,700,000
Exercise of stock options 0 21,366
Excess tax (expense) benefit derived from exercise of stock options (907,270) 470,584
Cash settlement of contingent consideration 0 (1,618,983)
Repurchase of common shares (1,879,395) (4,669,873)
Net cash used in financing activities (786,665) (4,096,906)
Net decrease in cash and cash equivalents (2,656,815) (1,549,746)
Cash and cash equivalents at beginning of period 38,203,059 39,866,037
Cash and cash equivalents at end of period 35,546,244 38,316,291
Non-cash investing and financing activities:    
Net change in unpaid additions to intangibles, property and equipment $ (82,487) $ 1,266,759