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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Cash flows provided by operating activities:    
Net income $ 6,322 $ 129
Depreciation and amortization 121 161
Decrease in the provision for credit losses (6)
Impairment of inventory 12 8
Non-cash lease expense 129 128
Deferred income tax benefit (4,435)
Stock-based compensation 56 55
Change in operating assets and liabilities:    
(Increase) decrease in accounts receivable (1,391) 61
Decrease (increase) in inventory 514 (181)
Decrease in deferred COGS 809 409
Decrease in other current assets and other assets 63 49
Increase in state income tax receivable (10)
Decrease in deferred revenue (1,351) (587)
Decrease in operating lease liability (143) (138)
Increase in state income tax payable 19
Increase (decrease) in accounts payable, accrued expenses, other current liabilities and non-current liabilities 196 (22)
Net cash provided by operating activities 905 72
Cash flows used in investing activities:    
Investments in technology (48) (76)
Equipment purchases (8) (2)
Net cash used in investing activities (56) (78)
Cash flows provided by financing activities:    
Warrant exercise proceeds 5
Stock option exercise proceeds 28
Net cash provided by financing activities 28 5
Net increase (decrease) in cash 877 (1)
Cash at the beginning of the year 1,449 1,450
Cash at the end of the year 2,326 1,449
Cash paid during the year for:    
Interest 1 3
Income taxes 108
Non-cash investing and financing activities:    
Accrued preferred dividends to former CEO of OmniMetrix (see Note 3) $ 4 $ 4