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Condensed Consolidated Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net income (loss) $ (2,574,165) $ (4,801,660)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization expense 3,278,958 2,108,051
Deferred tax expense 43,605 0
Share-based compensation 1,107,817 1,005,239
Decrease in non-cash contingent consideration (681,577) 0
Noncash interest expense 36,292 44,117
Noncash investment gains (34,303) (131,652)
Net changes in assets and liabilities affecting operating activities:    
Accounts receivable 547,577 1,339,974
Inventories 2,214,103 311,419
Other current assets and other assets 195,529 966,817
Accounts payable and other current liabilities (1,726,832) (1,595,243)
Other long-term liabilities (207,648) 142,486
Net cash provided by (used in) operating activities 2,199,356 (610,452)
Cash flows from investing activities:    
Additions to property and equipment (166,407) (171,731)
Purchases of marketable securities (9,627,191) (20,851,951)
Proceeds from sale of marketable securities 15,686,334 16,122,376
Cash paid for acquisitions (5,000,000) 0
Additions to intangible assets (498,003) (1,411,710)
Net cash provided by (used in) investing activities 394,733 (6,313,016)
Cash flows from financing activities:    
Borrowings on line of credit 56,000,000 36,000,000
Repayments on line of credit (56,000,000) (33,800,000)
Proceeds from sales of common stock, net of offering costs 0 200,909
Payments of deferred offering costs 0 (248,108)
Payments of financing costs (52,500) 0
Cash payment of contingent consideration (908,347) 0
Repurchase of common shares (2,593,778) (2,382,968)
Net cash used in financing activities (3,554,625) (230,167)
Net decrease in cash and cash equivalents (960,536) (7,153,635)
Cash and cash equivalents at beginning of period 27,938,960 45,412,868
Cash and cash equivalents at end of period 26,978,424 38,259,233
Supplemental non-cash operating, investing and financing activities:    
Recognition of operating lease assets and liabilities through adoption of ASC 842 3,629,320 0
Sale of subsidiary shares to noncontrolling interest 1,000,000 0
Repurchase of subsidiary shares from noncontrolling interests (800,000) 0
Additions to intangible assets from final purchase price allocation $ 148,000 $ 0