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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net income/(loss) $ (576,000) $ 396,000
Adjustments to reconcile net income (loss) to net cash used in operating activities    
Depreciation and amortization 62,000 80,000
Equity compensation expense 122,000 7,000
Change in assets and liabilities:    
Accounts receivable (423,000) (1,726,000)
Inventories 81,000 381,000
Prepaid expenses and other assets (62,000) (100,000)
Trade payables 47,000 (35,000)
Accrued liabilities (18,000) (372,000)
Net cash used in operating activities (767,000) (1,369,000)
Cash flows from investing activities:    
Purchases of property, plant and equipment (154,000) (56,000)
Net cash used in investing activities (154,000) (56,000)
Cash flows from financing activities:    
Receipt for preferred stock issuance 500,000
Repayment of note payable, related party (1,000,000)
Net advances (repayments) of term loan (16,000) (45,000)
Net advances (repayments) on revolving line of credit 565,000 1,454,000
Net cash provided by financing activities 49,000 1,409,000
Net (decrease) / increase in cash and cash equivalents (872,000) (16,000)
Cash and cash equivalents at beginning of period 921,000 146,000
Cash and cash equivalents at end of period 49,000 130,000
Supplemental disclosure of cash flow information and noncash investing and financing activities:    
Cash payments for interest 218,000 118,000
Accretion of dividends on preferred stock 14,000 11,000
Conversion of notes and deposits into common stock 885,000
Reclassification of advances upon issuances of preferred stock 1,500,000
Allocation of proceeds from preferred stock financing to the issuance of warrants for preferred stock $ 814,000