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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss from continuing operations $ (3,898,000) $ (920,000)
Adjustments to reconcile net loss from continuing operations to net cash used by operating activities:    
Depreciation and amortization 518,000 303,000
Stock based compensation 15,000 90,000
Loss on equity method investment 579,000
Loss (gain) on investments 1,076,000 (4,000)
Gain on extinguishment of debt (116,000)
Deferred tax benefit (838,000)
Decrease (increase) in assets:    
Accounts receivable, net 90,000 284,000
Inventory (601,000) (29,000)
Prepaid expenses and other current assets (92,000) (30,000)
Other assets (382,000) (129,000)
Increase (decrease) in liabilities:    
Accounts payable 106,000 11,000
Accrued expenses (3,472,000) (157,000)
Other liabilities (778,000)
Net cash used by operating activities (7,793,000) (581,000)
Cash flows from investing activities:    
Purchase of property, plant and equipment (72,000) (68,000)
Purchase of investment (3,230,000)
Purchase of marketable securities (4,329,000) (566,000)
Sale of marketable securities 2,188,000
Note receivable investment (1,006,000) (462,000)
Net cash used by investing activities (6,449,000) (1,096,000)
Cash flows from financing activities:    
Payments of long-term debt (89,000) (88,000)
Borrowings of long-term debt 110,000 200,000
Borrowings from lines of credit, net 300,000
Issuances of common stock, net of issuance costs 61,068,000 3,929,000
Net cash provided by financing activities 61,089,000 4,341,000
Cash flows from discontinued operations:    
Cash (used) provide by operations (12,000) 112,000
Cash used by investing activities (37,000)
Cash provided by financing activities 33,000
Net cash (used) provided by discontinued operations (12,000) 42,000
Net increase in cash 46,835,000 2,706,000
Cash and cash equivalents at beginning of period 5,226,000 1,096,000
Cash and cash equivalents at end of period $ 52,061,000 $ 3,802,000