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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Statement of Cash Flows [Abstract]    
Net loss $ (910,000) $ (895,000)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation and amortization 107,000 161,000
Stock-based compensation 175,000 28,000
Stock and options issued for services 83,000 98,000
Changes in assets and liabilities    
Accounts receivable (445,000) (497,000)
Other receivables 90,000 (232,000)
Inventories (7,000) (145,000)
Prepaid expenses and other assets (92,000) (39,000)
Accounts payable (228,000) 404,000
Accrued expenses (15,000) (15,000)
Net cash used in operating activities (1,242,000) (1,132,000)
Investing activities    
Purchase of property and equipment (14,000)
Net cash used in investing activities (14,000)
Financing activities    
Proceeds from issuance of stock 5,000
Net cash provided by financing activities 5,000
Net decrease in cash and restricted cash (1,242,000) (1,141,000)
Cash and restricted cash, beginning of period 3,019,000 5,675,000
Cash and restricted cash, end of period 1,777,000 4,534,000
Cash paid during the year for:    
Amounts included in the measurement of lease liabilities 20,000 20,000
Non-cash financing and investing activities:    
Value of shares relinquished in modification of stock-based compensation awards (Note 5) $ 24,000