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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Operating activities    
Net loss $ (2,167) $ (2,986)
Depreciation 153 203
Amortization of right-of-use assets 285 261
Amortization of imputed interest (428) (448)
Interest expense from PPP Loan 4 9
Gain on forgiveness of PPP Loan (1,417)
Non-cash cost of operating leases 580 622
Change in receivable reserves 71 (57)
Change in inventory reserves 127 (535)
Write down of inventory 546
Change in long term payables 4
Proceeds from insurance receivable 95 1,705
Gain on investments (968)
Stock-based compensation 186 3
Other 3
Changes in current operating assets and liabilities:    
Accounts receivable 115 1,158
Inventories (1,883) 2,139
Prepaid expenses and other assets (195) (692)
Income taxes 397 (501)
Accounts payable and accrued liabilities 27 (3,352)
Deferred revenue 1,709 (727)
Net cash used in operating activities (2,341) (3,613)
Investing activities    
Additions to property, plant and equipment (237)
Proceeds from sale of investments 2,436
Change in notes receivable 194
Net cash (used in) / provided by investing activities (237) 2,630
Financing activities    
Bank overdrafts (374)
Funding from PPP Loan 1,404
Payment of deferred purchase price (397)
Payment of deferred payroll taxes (100)
Net proceeds from the exercise of options for common stock 58
Net proceeds from issuance of common stock 8,663
Dividend paid to shareholders (1,047)
Principal repayments of financing leases (864) (296)
Net cash provided by financing activities 6,710 337
 Increase / (decrease) in cash and restricted cash 4,132 (646)
Cash, and restricted cash, beginning of year 7,567 8,213
Cash, and restricted cash, end of period 11,699 7,567
Supplemental cash flow information:    
Interest paid 3 28
Income taxes paid, net of refunds (395) 507
Non-cash investing and financing activities:    
Acquisition of right-of-use assets $ 1,598