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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net income (loss) $ (329,495) $ 420,810
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization expense 1,171,437 1,143,002
Deferred tax benefit 533,067 23,593
Share-based compensation 408,226 549,603
Excess tax expense (benefit) derived from exercise of stock options 835,016 (313,955)
Noncash interest expense 37,323 19,782
Noncash investment gains (51,213) (44,870)
Net changes in assets and liabilities affecting operating activities:    
Accounts receivable 1,526,175 (303,286)
Inventory (651,538) 804,776
Other current assets and other assets (97,871) 422,946
Accounts payable and other current liabilities (4,061,546) 1,265,725
Other long-term liabilities 136,483 79,742
Net cash (used in) provided by operating activities (543,936) 4,067,868
Cash flows from investing activities:    
Additions to property and equipment (70,454) (62,291)
Purchases of marketable securities (2,959,285) (4,046,142)
Proceeds from sale of marketable securities 3,009,459 4,795,505
Additions to intangible assets (1,077,547) (2,740,001)
Net cash used in investing activities (1,097,827) (2,052,929)
Cash flows from financing activities:    
Net borrowings on line of credit 1,800,000 1,700,000
Exercise of stock options 0 21,366
Excess tax (expense) benefit derived from exercise of stock options (835,016) 313,955
Cash settlement of contingent consideration 0 (1,618,983)
Repurchase of common shares (1,689,040) (3,356,633)
Net cash used in financing activities (724,056) (2,940,295)
Net decrease in cash and cash equivalents (2,365,819) (925,356)
Cash and cash equivalents at beginning of period 38,203,059 39,866,037
Cash and cash equivalents at end of period $ 35,837,240 $ 38,940,681