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Condensed Consolidated Statements of Cash Flows - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income (loss) $ (40,418) $ (2,392,189)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization expense 1,076,246 692,991
Deferred tax expense 43,605 0
Share-based compensation 364,434 339,209
(Decrease) increase in non-cash contingent consideration (269,422) 0
Noncash interest expense 10,497 18,303
Noncash investment gains (44,191) (43,338)
Net changes in assets and liabilities affecting operating activities:    
Accounts receivable (2,129,746) 2,093,950
Inventories 819,110 76,323
Other current assets and other assets 134,578 600,884
Accounts payable and other current liabilities 3,499 (1,254,535)
Other long-term liabilities (353,925) 103,991
Net cash provided by (used in) operating activities (385,733) 235,589
Cash flows from investing activities:    
Additions to property and equipment (27,474) (94,881)
Purchases of marketable securities (7,816,191) (15,151,948)
Proceeds from sale of marketable securities 6,483,988 4,257,657
Additions to intangible assets (363,711) (532,954)
Net cash used in investing activities (1,723,388) (11,522,126)
Cash flows from financing activities:    
Borrowings on line of credit 19,000,000 12,000,000
Repayments on line of credit (19,000,000) (9,800,000)
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 (507,505) 0
Repurchase of common shares (712,919) (1,016,156)
Net cash provided by (used in) financing activities (1,220,424) 1,136,645
Net increase (decrease) in cash and cash equivalents (3,329,545) (10,149,892)
Cash and cash equivalents at beginning of period 27,938,960 45,412,868
Cash and cash equivalents at end of period 24,609,415 35,262,976
Recognition of operating lease assets and liabilities through adoption of ASC 842 $ 3,629,320 $ 0