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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net income (loss) $ (607,230) $ (3,137,639)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization expense 2,174,397 1,394,728
Deferred tax expense 43,605 0
Share-based compensation 760,982 665,309
(Decrease) increase in non-cash contingent consideration (321,894) 0
Noncash interest expense 28,111 33,730
Noncash investment gains (125,804) (118,188)
Net changes in assets and liabilities affecting operating activities:    
Accounts receivable (583,029) 2,589,017
Inventories 1,429,484 (607,653)
Other current assets and other assets 141,577 804,729
Accounts payable and other current liabilities (1,132,333) (730,760)
Other long-term liabilities (342,940) 136,402
Net cash provided by operating activities 1,464,926 1,029,675
Cash flows from investing activities:    
Additions to property and equipment (89,070) (131,684)
Purchases of marketable securities (9,627,191) (16,916,890)
Proceeds from sale of marketable securities 8,563,988 6,904,205
Cash paid for acquisitions (5,000,000) 0
Additions to intangible assets (395,005) (593,121)
Net cash used in investing activities (6,547,278) (10,737,490)
Cash flows from financing activities:    
Borrowings on line of credit 36,000,000 24,000,000
Repayments on line of credit (36,000,000) (21,800,000)
Proceeds from sales of common stock, net of offering costs 0 200,909
Payments of deferred offering costs 0 (248,108)
Cash payment of contingent consideration (684,738) 0
Repurchase of common shares (1,220,690) (1,951,199)
Net cash (used in) provided by financing activities (1,905,428) 201,602
Net increase (decrease) in cash and cash equivalents (6,987,780) (9,506,213)
Cash and cash equivalents at beginning of period 27,938,960 45,412,868
Cash and cash equivalents at end of period 20,951,180 35,906,655
Supplemental non-cash operating, investing and financing activities:    
Recognition of operating lease assets and liabilities through adoption of ASC 842 3,629,320 0
Repurchase of subsidiary shares from noncontrolling interests (800,000) 0
Additions to intangible assets from final purchase price allocation $ 148,000 $ 0