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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Operating activities:    
Net income $ 497 $ 1,150
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 195 202
Gain on sale of assets (9)
Stock-based compensation expense 51 25
Deferred tax (benefit) / expense (19) 34
Bad debt expense 5 28
Forgiveness of note payable from Paycheck Protection Program (1,037)
Changes in operating assets and liabilities:    
Accounts receivable (27) 614
Inventory (48) (350)
Prepaid expenses and other assets (56) (31)
Accounts payable 147 26
Accrued expenses and other current liabilities 613 309
Deferred revenue (236) 203
Right of use assets and liabilities, net (2) 2
Net cash provided by operating activities 1,120 1,166
Investing activities:    
Purchases of property, equipment and software development costs (16) (170)
Net cash used in investing activities (16) (170)
Financing activities:    
Repayments of finance lease obligations (3) (3)
Proceeds from stock option exercise 40
Stock repurchase under Stock Buyback Plan (422) (411)
Net cash used in financing activities (425) (374)
Net change in cash 679 622
Cash at beginning of period 5,414 4,374
Cash at end of period $ 6,093 $ 4,996