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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net income (loss) $ (1,065,145) $ (40,418)
Discontinued operations 818,273 1,147,136
Net income (loss) from continuing operations (1,883,418) (1,187,554)
Adjustments to reconcile net income (loss) from continuing operations to net cash provided by (used in) operating activities:    
Depreciation and amortization expense 1,152,062 1,076,246
Deferred tax expense 0 43,605
Share-based compensation 264,574 364,434
Decrease in non-cash contingent consideration (543,006) (269,422)
Noncash interest expense 11,333 10,497
Noncash investment gains 0 (44,191)
Net changes in assets and liabilities affecting operating activities:    
Accounts receivable 2,014,438 (1,361,692)
Inventories 706,102 494,395
Other current assets and other assets 1,093,517 134,578
Accounts payable and other current liabilities (2,394,824) 474,354
Other long-term liabilities (865,109) (353,925)
Net cash provided by (used in) operating activities from continuing operations (444,331) (618,675)
Discontinued operations 1,332,870 232,942
Net cash provided by (used in) operating activities 888,539 (385,733)
Cash flows from investing activities:    
Additions to property and equipment (22,726) (27,474)
Purchases of marketable securities 0 (7,816,191)
Proceeds from sale of marketable securities 0 6,483,988
Additions to intangible assets (548,435) (363,711)
Net cash used in investing activities (571,161) (1,723,388)
Cash flows from financing activities:    
Borrowings on line of credit 18,500,000 19,000,000
Repayments on line of credit (18,500,000) (19,000,000)
Cash payment of contingent consideration (260,735) (507,505)
Repurchase of subsidiary shares from noncontrolling interest (800,000) 0
Repurchase of common shares (442,544) (712,919)
Net cash used in financing activities (1,503,279) (1,220,424)
Net decrease in cash and cash equivalents (1,185,901) (3,329,545)
Cash and cash equivalents at beginning of period 28,212,635 27,938,960
Cash and cash equivalents at end of period 27,026,734 24,609,415
Supplemental non-cash operating, investing and financing activities:    
Recognition of operating lease assets and liabilities through adoption of ASC 842 $ 0 $ 3,629,320