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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Operating activities:    
Net income $ 2,219 $ 840
Adjustments to reconcile net loss to net cash    
Depreciation and amortization 601 736
Gain on sale of assets (9) (19)
Stock-based compensation expense 222 80
Deferred tax expense (8) 28
Bad debt expense 45 49
Forgiveness of note payable from Paycheck Protection Program (1,037)
Changes in operating assets and liabilities, net of effect from acquisitions:    
Accounts receivable 135 (57)
Short-term investments (4)
Inventory (870)
Prepaid expenses and other assets 308 (267)
Accounts payable 247 (70)
Accrued expenses and other current liabilities 747 505
Deferred revenue 429 351
Right of use assets and liabilities, net 4 4
Net cash provided by operating activities 3,033 2,176
Investing activities:    
Acquisition of Postelsia Holdings, Ltd. (300)
Proceeds from sale of assets 34
Purchases of property, equipment and software development costs (176) (416)
Net cash used in investing activities (176) (682)
Financing activities:    
Proceeds from long term debt 1,030
Repayments of finance lease obligations (7) (6)
Proceeds from stock option exercise 45 3
Dividends paid to shareholders (914)
Stock repurchase under Stock Buyback Plan (713) (534)
Net cash (used in) / provided by financing activities (1,589) 493
Net change in cash 1,268 1,987
Cash at beginning of period 4,374 2,638
Cash at end of period $ 5,642 $ 4,625