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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net income (loss) $ (6,470,771) $ (329,495)
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation and amortization expense 1,314,293 1,171,437
Deferred tax expense 4,293,963 533,067
Share-based compensation 551,255 408,226
Excess tax (benefit) expense derived from exercise of stock options (91,109) 835,016
Noncash interest expense 51,216 37,323
Noncash investment gains (18,706) (51,213)
Net changes in assets and liabilities affecting operating activities:    
Accounts receivable 1,223,213 1,526,175
Inventories (182,595) (651,538)
Other current assets and other assets (81,286) (97,871)
Accounts payable and other current liabilities (1,920,653) (4,061,546)
Other long-term liabilities 240,185 136,483
Net cash used in operating activities (1,090,995) (543,936)
Cash flows from investing activities:    
Additions to property and equipment (143,150) (70,454)
Purchases of marketable securities (1,201,895) (2,959,285)
Proceeds from sale of marketable securities 2,486,386 3,009,459
Additions to intangible assets (753,900) (1,077,547)
Net cash provided by (used in) investing activities 387,441 (1,097,827)
Cash flows from financing activities:    
Net borrowings on line of credit 2,600,000 1,800,000
Excess tax expense derived from exercise of stock options 0 (835,016)
Repurchase of common shares (1,790,671) (1,689,040)
Net cash provided by (used in) financing activities 809,329 (724,056)
Net increase (decrease) in cash and cash equivalents 105,775 (2,365,819)
Cash and cash equivalents at beginning of period 34,510,330 38,203,059
Cash and cash equivalents at end of period $ 34,616,105 $ 35,837,240