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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Operating activities:    
Net income $ 653 $ 719
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 335 392
Gain on sale of assets (5)
Stock-based compensation expense 32 83
Deferred tax expense / (benefit) 9 (33)
Bad debt (recovery) / expense (33) 17
Changes in operating assets and liabilities:    
Accounts receivable 198
Inventory (308) (110)
Prepaid expenses and other assets (250) (472)
Accounts payable 73 274
Accrued expenses and other current liabilities 235 897
Deferred revenue 563 309
Right of use assets and liabilities, net (9) (4)
Net cash provided by operating activities 1,295 2,270
Investing activities:    
Investment in BlueTrace (200)
Purchase of digital assets (178)
Purchases of property, equipment and software development costs (27) (29)
Net cash used in investing activities (227) (207)
Financing activities:    
Repayments of finance lease obligations (6) (6)
Proceeds from stock option exercise 46 7
Stock repurchase under Stock Buyback Plan (2,066) (1,070)
Net cash used in financing activities (2,026) (1,069)
Net change in cash (958) 994
Cash at beginning of period 4,368 5,414
Cash at end of period $ 3,410 $ 6,408