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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Operating activities:    
Net income $ 2,961 $ 1,385
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 799 997
Gain on sale of assets (95) (18)
Stock-based compensation expense 291 121
Deferred tax benefit (21) (65)
Bad debt expense 53
Forgiveness of note payable from Paycheck Protection Program (1,037)
Effect of acquisition fair value adjustment 41
Changes in operating assets and liabilities, net of effect from acquisitions:    
Accounts receivable 330 (46)
Short-term investments 258
Inventory (767)
Prepaid expenses and other assets 267 (142)
Accounts payable (202) (374)
Accrued expenses and other current liabilities 108 (75)
Deferred revenue 381 335
Right of use assets and liabilities, net 5 (18)
Net cash provided by operating activities 3,020 2,452
Investing activities:    
Acquisition of Postelsia Holdings, Ltd. (300)
Proceeds from sale of assets 210 34
Purchases of property, equipment and software development costs (213) (464)
Net cash used in investing activities (3) (730)
Financing activities:    
Proceeds from long term debt 1,030
Proceeds from finance lease obligations 24
Repayments of finance lease obligations (10) (8)
Proceed from stock option exercise 52 5
Dividends paid to shareholders (914)
Stock repurchase under Stock Buyback Plan (1,105) (1,037)
Net cash (used) in / provided by financing activities (1,977) 14
Net change in cash 1,040 1,736
Cash at beginning of period 4,374 2,638
Cash at end of period $ 5,414 $ 4,374