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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating activities:    
Net income $ 178 $ 121
Adjustments to reconcile net income to net cash    
Depreciation and amortization 155 172
Stock-based compensation expense 11 15
Deferred tax benefit 11 (3)
Bad debt expense 4 13
Changes in operating assets and liabilities:    
Accounts receivable 49 94
Inventory (10) (82)
Prepaid expenses and other assets (40) (25)
Accounts payable 110 27
Accrued expenses and other current liabilities 266 164
Deferred revenue (28) (22)
Right of use assets and liabilities, net (6) (1)
Net cash provided by operating activities 700 473
Investing activities:    
Investment in BlueTrace (200)
Purchases of property, equipment and software development costs (24) (7)
Net cash used in investing activities (24) (207)
Financing activities:    
Repayments of finance lease obligations (3) (4)
Proceeds from stock option exercise 64
Private purchase of common shares (1,027)
Stock repurchase under Stock Buyback Plan (469) (1,230)
Net cash used in financing activities (1,435) (1,234)
Net change in cash (759) (968)
Cash at beginning of period 2,641 4,368
Cash at end of period $ 1,882 $ 3,400