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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net loss $ (1,595,000) $ (1,164,000)
Adjustments to reconcile net income (loss) to net cash used by operating activities:    
Depreciation and amortization 578,000 546,000
Stock based compensation 84,000 59,000
Unrealized gain on investment (584,000)
Amortization of deferred financing costs and debt discount 1,000
Decrease (increase) in assets:    
Accounts receivable 1,399,000 (176,000)
Inventory (266,000) 295,000
Prepaid expenses and other current assets (81,000) 54,000
Other assets (94,000)
Increase (decrease) in liabilities:    
Accounts payable (786,000) 141,000
Accrued expenses (169,000) (250,000)
Other liabilities 133,000 (1,326,000)
Net cash used by operating activities (1,381,000) (1,820,000)
Cash flows from investing activities:    
Purchase of property, plant and equipment (84,000) (95,000)
Purchase of investment (1,291,000)
Purchase of marketable securities (1,392,000)
Note receivable investment 566,000
Purchase of intangible assets (350,000)
Net cash used by investing activities (3,333,000) (445,000)
Cash flows from financing activities:    
Payments of long-term debt (142,000) (56,000)
Borrowings of long-term debt 1,272,000
Borrowings from revolving lines of credit, net (500,000)
Borrowings from convertible of note 500,000
Issuances of common stock, net of issuance costs 10,220,000 4,880,000
Net cash provided by financing activities 10,850,000 5,324,000
Cash flows from discontinued operations:    
Cash provided by operations - discontinued operations 73,000 (15,267)
Cash used by investing activities (62,000) (54,000)
Cash provided by financing activities (67,000) (66,000)
Net cash used by discontinued operations (56,000) (135,267)
Net increase in cash 6,080,000 2,924,000
Cash at beginning of period 1,096,000 2,448,000
Cash at end of period $ 7,176,000 $ 5,372,000