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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Statement of Cash Flows [Abstract]    
Net loss $ (1,973,000) $ (2,123,000)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation 757,000 514,000
Depreciation and amortization 217,000 325,000
Amortization of debt discounts 17,000
Stock and options issued for services 11,000
Changes in assets and liabilities    
Accounts receivable (842,000) (1,033,000)
Other receivables 130,000 (15,000)
Inventories 444,000 300,000
Prepaid expenses and other assets (95,000) (27,000)
Accounts payable (379,000) 195,000
Accrued expenses 180,000 (137,000)
Net cash used in operating activities (1,544,000) (1,990,000)
Investing activities    
Purchase of property and equipment (61,000)
Net cash used in investing activities (61,000)
Financing activities    
Borrowings under line of credit 930,000
Repayment of line of credit (847,000)
Issuance of convertible debt 65,000
Financing agreement payments (13,000)
Repurchases from stock compensation program (20,000) (18,000)
Net cash provided by (used in) financing activities 115,000 (18,000)
Net decrease in cash (1,490,000) (2,008,000)
Cash, beginning of period 1,891,000 3,019,000
Cash, end of period 401,000 1,011,000
Cash paid during the period for:    
Amounts included in the measurement of lease liabilities 20,000
Non-cash financing and investing activities:    
Convertible notes issued in exchange for trade payables 71,000
Conversion of debt and interest to equity 136,000
Financed acquisition of long-term assets 245,000
Value of shares relinquished in modification of stock-based compensations awards $ 24,000