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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Cash flows from operating activities:                
Net loss $ (2,119,000) $ (983,000) $ (1,136,000) $ (1,049,000) $ (1,219,000) $ (2,119,000) $ (2,268,000)  
Adjustments to reconcile net loss to net cash used in operating activities:                
Amortization   0   87,000   0 173,000  
Bad debt (recovery) expense           0 (32,000)  
Non-cash lease expense from right-of-use asset           17,000 77,000  
Stock-based compensation           62,000 442,000  
Casualty gain (insurance proceeds)   0   (400,000)   0 (400,000)  
Impairment charges - property and equipment           0 2,000  
Changes in operating assets and liabilities:                
Accounts receivable           393,000 203,000  
Inventory           151,000 321,000  
Prepaid expenses and other current assets           (74,000) 213,000  
Other assets           1,000 18,000  
Accounts payable           (100,000) (48,000)  
Accrued expenses and other current liabilities           151,000 (456,000)  
Deferred revenue           (75,000) (259,000)  
Lease liabilities           (17,000) (168,000)  
Net cash used in operating activities (1,610,000)         (1,610,000) (2,182,000)  
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 1,478,000         1,478,000 5,969,000  
(Decrease) increase in cash           (132,000) 3,787,000  
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 5,858,000 5,858,000   6,872,000   5,858,000 6,872,000 5,990,000
Reconciliation of cash and cash equivalents                
Cash 5,358,000 5,358,000   6,872,000   5,358,000 6,872,000  
Current certificates of deposit 500,000 500,000   0   500,000 0 500,000
Total cash and cash equivalents $ 5,858,000 5,858,000   6,872,000   5,858,000 6,872,000 $ 5,990,000
Cash paid during the period for interest           5,000 9,000  
Cash paid for income taxes           0 31,000  
Non-cash investing and financing activities:                
Preferred stock dividends           64,000 149,000  
Common stock issued for conversion of Preferred Stock and accrued dividends           194,000 4,000  
Warrant modification           0 25,000  
Induced exercise of common stock warrants   $ 0   $ 751,000   0 751,000  
Common Stock Warrants [Member]                
Cash flows from financing activities:                
Net proceeds from exercise of warrants           0 534,000  
Preferred Warrants [Member]                
Cash flows from financing activities:                
Net proceeds from exercise of warrants           $ 1,478,000 $ 0