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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Statement of Cash Flows [Abstract]    
Net loss $ (761,000) $ (449,000)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation 158,000 366,000
Depreciation and amortization 74,000 74,000
Gain on asset disposal
Amortization of line of credit discount 4,000
Changes in assets and liabilities    
Accounts receivable (670,000) (545,000)
Other receivables (57,000) 140,000
Inventories 372,000 (70,000)
Prepaid expenses and other assets (66,000) (107,000)
Accounts payable 222,000 (271,000)
Accrued expenses 218,000 93,000
Net cash used in operating activities (506,000) (769,000)
Investing activities    
Purchase of property and equipment (28,000)
Net cash used in investing activities (28,000)
Financing activities    
Borrowings under line of credit 782,000
Repayment of line of credit (1,402,000)
Issuance of convertible debt 65,000
Financing agreement payments (23,000)
Issuance of common stock, net of $26,000 issuance cost 2,974,000
Shares repurchased for income tax withholding under stock compensation program (160,000) (20,000)
Net cash provided by financing activities 2,171,000 45,000
Net increase (decrease) in cash 1,637,000 (724,000)
Cash, beginning of period 235,000 1,891,000
Cash, end of period 1,872,000 1,167,000
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 154,000
Cash paid for interest $ 19,000