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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income (loss) $ (1,003,938) $ 671,108 $ 2,362,465
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:      
Depreciation and amortization expense 2,396,908 2,246,809 1,989,564
Deferred tax expense (benefit) 619,580 490,227 (309,330)
Share-based compensation 852,102 622,503 761,663
Excess tax expense (benefit) derived from exercise of stock options 1,026,413 (90,982) (1,653,028)
Noncash interest expense 84,539 46,422 38,634
Noncash investment gains (74,015) (77,155) (52,040)
Net changes in assets and liabilities affecting operating activities, net of effect of business combination:      
Accounts receivable (1,253,007) (572,392) (974,304)
Inventories (1,101,586) 1,330,176 1,532,563
Prepaid, other current assets and other assets (1,556,282) (263,084) (1,011,365)
Accounts payable and other current liabilities 191,901 1,475,964 3,846,482
Other long-term liabilities 386,863 (2,731) 162,127
Net cash provided by operating activities 569,478 5,876,865 6,693,431
Cash flows from investing activities:      
Additions to property and equipment (130,872) (142,965) (163,258)
Cash paid for acquisitions 0 0 (2,000,000)
Additions to intangible assets (2,000,226) (2,556,465) (3,101,565)
Proceeds from sale of marketable securities 4,489,111 7,883,171 3,437,645
Purchases of marketable securities (5,473,092) (7,528,713) (4,207,262)
Net cash used in investing activities (3,115,079) (2,344,972) (6,034,440)
Cash flows from financing activities:      
Net borrowings on line of credit 2,400,000 1,700,000 0
Repurchase of common shares (2,520,715) (5,338,967) (4,315,444)
Cash settlement of contingent consideration 0 (1,668,252) 0
Exercise of stock options 0 21,366 0
Sale of subsidiary shares to noncontrolling interest 0 0 1,000,005
Excess tax (expense) benefit derived from exercise of stock options (1,026,413) 90,982 1,653,028
Net cash used in financing activities (1,147,128) (5,194,871) (1,662,411)
Net decrease in cash and cash equivalents (3,692,729) (1,662,978) (1,003,420)
Cash and cash equivalents, beginning of year 38,203,059 39,866,037 40,869,457
Cash and cash equivalents, end of year 34,510,330 38,203,059 39,866,037
Net cash paid during the year for:      
Interest 21,853 27,434 28,440
Income taxes (8,359) 52,238 17,077
Noncash investing and financing activities:      
Change in unpaid invoices for purchases of intangibles $ (1,179,394) $ 967,146 $ (1,574,847)