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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Cash flows from operating activities:              
Net loss $ (1,040,000) $ (1,136,000) $ (895,000) $ (1,219,000) $ (3,159,000) $ (3,163,000)  
Adjustments to reconcile net loss to net cash used in operating activities:              
Amortization 0   86,000   0 259,000  
Bad debt (recovery) expense         0 (55,000)  
Non-cash lease expense from right-of-use asset         17,000 101,000  
Stock-based compensation         62,000 473,000  
Impairment charges - property and equipment         0 2,000  
Changes in operating assets and liabilities:              
Accounts receivable         391,000 313,000  
Inventory         189,000 399,000  
Prepaid expenses and other current assets         (40,000) 319,000  
Other assets         4,000 24,000  
Accounts payable         (118,000) (78,000)  
Accrued expenses and other current liabilities         254,000 (335,000)  
Deferred revenue         (104,000) (354,000)  
Lease liabilities         (17,000) (193,000)  
Net cash used in operating activities         (2,521,000) (2,288,000)  
Cash flows from financing activities:              
Proceeds from private placement, net of issuance costs and amounts in escrow         0 5,435,000  
Net cash provided by financing activities         2,149,000 5,969,000  
(Decrease) increase in cash         (372,000) 3,681,000  
Cash and cash equivalents at beginning of period   $ 5,990,000   $ 3,085,000 5,990,000 3,085,000 $ 3,085,000
Cash and cash equivalents at end of period 5,618,000   6,766,000   5,618,000 6,766,000 5,990,000
Reconciliation of cash and cash equivalents              
Cash 5,119,000   6,266,000   5,119,000 6,266,000  
Current certificates of deposit 500,000   500,000   500,000 500,000 500,000
Total cash and cash equivalents 5,619,000   6,766,000   5,619,000 6,766,000 $ 5,990,000
Cash paid during the period for interest         0 18,000  
Cash paid for income taxes         0 31,000  
Non-cash investing and financing activities:              
Preferred stock dividends         76,000 282,000  
Warrants, deemed dividend 8,974,000   0   8,974,000 0  
Warrant modification         0 25,000  
Common stock issued for conversion of Preferred Stock         194,000 47,000  
Induced exercise of common stock warrants $ 0   $ 0   0 751,000  
Common Stock Warrants [Member]              
Cash flows from financing activities:              
Net proceeds from exercise of common stock warrants         671,000 534,000  
Preferred Warrants [Member]              
Cash flows from financing activities:              
Net proceeds from exercise of common stock warrants         $ 1,478,000 $ 0