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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income (loss) $ 671,108 $ 2,362,465 $ (2,151,418)
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:      
Depreciation and amortization expense 2,246,809 1,989,564 1,301,835
Deferred tax expense (benefit) 490,227 (309,330) (1,579,918)
Share-based compensation 622,503 761,663 674,955
Excess tax benefit derived from exercise of stock options (90,982) (1,653,028) (48,024)
Noncash interest expense 46,422 38,634 24,075
Noncash investment (gains) losses (77,155) (52,040) 178,822
Net changes in assets and liabilities affecting operating activities, net of effect of business combination:      
Accounts receivable (572,392) (974,304) 1,486,777
Inventories 1,330,176 1,532,563 495,473
Prepaid, other current assets and other assets (263,084) (1,011,365) 117,021
Accounts payable and other current liabilities 1,475,964 3,846,482 58,855
Other long-term liabilities (2,731) 162,127 187,673
Net cash provided by operating activities 5,876,865 6,693,431 746,126
Cash flows from investing activities:      
Additions to property and equipment (142,965) (163,258) (97,412)
Cash paid for acquisitions 0 (2,000,000) 0
Additions to intangible assets (2,556,465) (3,101,565) (7,462,080)
Proceeds from sale of marketable securities 7,883,171 3,437,645 6,859,061
Purchases of marketable securities (7,528,713) (4,207,262) (4,371,508)
Net cash used in investing activities (2,344,972) (6,034,440) (5,071,939)
Cash flows from financing activities:      
Net (repayments) borrowings on line of credit 1,700,000 0 (4,359,951)
Repurchase of common shares (5,338,967) (4,315,444) (4,800,908)
Cash settlement of contingent consideration (1,668,252) 0 0
Exercise of stock options 21,366 0 (41,276)
Sale of subsidiary shares to noncontrolling interest 0 1,000,005 0
Excess tax benefit derived from exercise of stock options 90,982 1,653,028 48,024
Net cash used in financing activities (5,194,871) (1,662,411) (9,154,111)
Net decrease in cash and cash equivalents (1,662,978) (1,003,420) (13,479,924)
Cash and cash equivalents, beginning of year 39,866,037 40,869,457 54,349,381
Cash and cash equivalents, end of year 38,203,059 39,866,037 40,869,457
Net cash paid (refunded) during the year for:      
Interest 27,434 28,440 79,347
Income taxes 52,238 17,077 (129,509)
Noncash investing and financing activities:      
Change in unpaid invoices for purchases of intangibles $ 967,146 $ (1,574,847) $ 543,905